Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

GCSE Combined Chemistry (Edexcel) > Topic 7 - Fuels and Earth Science COMPLETE PK > Flashcards

Topic 7 - Fuels and Earth Science COMPLETE PK Flashcards

You may prefer our related Brainscape-certified flashcards:
GCSE Geography - AQA flashcards AP® Chemistry flashcards GCSE Religious Studies - Edexcel Route B flashcards GCSE Religious Studies - Eduqas Route A flashcards GCSE Religious Studies - Edexcel Route A flashcards GCSE Religious Studies - Eduqas Route B flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 flashcards
1
Q

1 What are the chemical symbols for the elements carbon and hydrogen?

A

C; H

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

2 What type of bond (ionic, metallic or covalent) is found in simple molecules?

A

covalent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

3 What state (solid, liquid or gas) is crude oil at room temperature?

A

liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

4 How many shared electrons are there in a covalent bond?

A

two

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

5 Which element forms long chains in simple polymers such as polyethene

A

carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

6 Which type of compound only contains hydrogen and carbon atoms?

A

hydrocarbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

7 Are ‘petrochemicals’ made from petrol, rock or crude oil?

A

crude oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

8 How many years (hundreds, thousands or millions) does it take for crude oil to form?

A

millions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

9 If something is not being made any more, is it described as ‘finite’ or as ‘non-renewable’?

A

finite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

10 About how many litres of crude oil does the world use each second (180, 1800 or 180 000)?

A

180 000

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

11 Name the two elements found in hydrocarbons.

A

carbon; hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

12 Crude oil is forming extremely slowly. Does this make it a finite resource or a non-renewable one?

A

finite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

13 Petrol comes from crude oil. Give one use for petrol.

A

fuel for cars

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

14 Name the main hydrocarbon found in natural gas.

A

methane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

15 Diesel oil is being used up faster than crude oil forms. Does this make it a finite resource or a non-renewable one?

A

non-renewable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

16 Name the polymer formed from ethene, which comes from crude oil.

A

polyethene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

17 Name the state change that occurs when a gas becomes a liquid.

A

condensing/condensation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

18 What bonds or forces exist between molecules (ionic, covalent or intermolecular)?

A

intermolecular forces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

19 Compared with metals, do simple molecules typically have high boiling points or low ones?

A

low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

20 Name the method used to separate a mixture of two or more liquids with different boiling points.

A

fractional distillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

21 Give one typical use of fuel oil.

A

fuel for large ships/fuel for some power stations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

22 Crude oil is a source of feedstock. Give one other type of useful substance from crude oil.

A

fuels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

23 Is crude oil described as a finite resource or an infinite resource?

A

finite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

24 Name a non-renewable fossil fuel obtained from crude oil.

A

petrol/kerosene/diesel oil/fuel oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

25 Name the main non-renewable fossil fuel in natural gas.

A

methane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

26 What process is used to separate crude oil into useful mixtures?

A

fractional distillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

27 Give one use for the gases fraction from crude oil.

A

domestic heating/cooking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

28 Which fraction is more easily ignited, bitumen or kerosene?

A

kerosene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

29 Which fraction is more viscous, bitumen or kerosene?

A

bitumen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

30 Which hydrocarbons have the greater boiling points, the ones with larger molecules or the ones with smaller molecules?

A

larger molecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

31 Which elements are present in hydrocarbon molecules?

A

carbon; hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

32 What is the most abundant element in air?

A

nitrogen/N2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

33 Which gas reacts with hydrocarbons when they burn?

A

oxygen/O2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

34 Name one fossil fuel used in cars.

A

petrol/diesel oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

35 Name a gas produced when carbon burns.

A

carbon monoxide/carbon dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

36 What compound forms when hydrogen burns in air?

A

water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

37 What is the main fossil fuel in natural gas?

A

methane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

38 To get a roaring blue Bunsen burner flame, do you open or close the air hole?

A

open it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

39 Which cells in the blood carry oxygen around the body?

A

red blood cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

40 What is the black solid element found in soot and smoke?

A

carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

41 What are the products of the complete combustion of hydrocarbon fuels?

A

carbon dioxide; water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

42 Which gas is produced during incomplete combustion, but not complete combustion, of hydrocarbon fuels?

A

carbon monoxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

43 What solid element is produced during the incomplete combustion of hydrocarbon fuels?

A

carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

44 Name the fuel used for large ships and some power stations.

A

fuel oil

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

45 Which gas reacts with hydrocarbon fuels when they burn?

A

oxygen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

46 What is the pH of pure water?

A

7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

47 Name the gas formed when acids react with metals.

A

hydrogen (MASH)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

48 Name the gas formed when acids react with calcium carbonate.

A

carbon dioxide (CASHOCO)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

49 Name the most abundant gas in the air.

A

nitrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

50 Name the solid yellow element placed below oxygen in group 6 of the period table.

A

sulfur

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

51 Name one hydrocarbon fuel used for cars.

A

petrol; diesel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

52 Which fraction ignites more easily, kerosene or fuel oil?

A

kerosene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

53 Which fraction contains hydrocarbon molecules with the longer molecules, gases or bitumen?

A

bitumen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

54 Name the process used to separate crude oil into simpler, more useful mixtures.

A

fractional distillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

55 Name the homologous series to which ethane belongs.

A

alkanes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

56 What are the two products of complete combustion of ethane?

A

carbon dioxide; water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

57 What type of rain forms when sulfur dioxide, from some hydrocarbon fuels, dissolves in rainwater?

A

acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

58 Name the greenhouse gas released when any hydrocarbon fuel burns.

A

carbon dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

59 Which occupies the least volume, 1 kg of hydrogen gas or 1 kg of liquid hydrogen?

A

1 kg of liquid hydrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

60 Is crude oil a finite resource or a renewable resource?

A

finite resource

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

61 Which common compound of carbon and oxygen is thought to have been an abundant gas in Earth’s early atmosphere?

A

carbon dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

62 What are the names of the Earth’s two nearest neighbouring planets?

A

Venus and Mars

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

63 Name the biological process that increases oxygen levels and reduces carbon dioxide levels in the atmosphere.

A

photosynthesis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

64 What geological feature of a planet’s surface can give out large amounts of hot gas?

A

volcano

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

65 Name the physical process that describes changing a vapour into liquid.

A

condensation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
66
Q

66 What type of reaction occurs when a metal gains oxygen?

A

oxidation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

67 How old do scientists think the Earth is: 4.5 billion years, 4.5 million years or 450 000 years?

A

4.5 billion years

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
68
Q

68 What sort of rocks are formed from layers of deposited material?

A

sedimentary rocks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
69
Q

69 Which gaseous element forms most of the Earth’s atmosphere today?

A

nitrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
70
Q

70 Titan is an icy moon of Saturn. What is ice made of?

A

water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
71
Q

71 Where were the gases that formed the Earth’s early atmosphere released from?

A

volcanoes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
72
Q

72 What two compounds are thought to have formed most of the Earth’s early atmosphere?

A

water, carbon dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
73
Q

73 What is the chemical test for carbon dioxide?

A

turns limewater milky/cloudy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
74
Q

74 What element forms most of the Earth’s atmosphere today?

A

nitrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
75
Q

75 Which element that makes up about 21% of the atmosphere of Earth today was not thought to be present in the atmosphere 4.5 billion years ago?

A

oxygen

76
Q

76 As the Earth evolved, chemical reactions with what element are thought to have slowed the release of oxygen to the atmosphere?

A

iron

77
Q

77 What gas given out by volcanoes is thought to have condensed to form oceans?

A

water vapour

78
Q

78 What factor has caused changes in Earth’s atmosphere but is not found on Venus or Mars?

A

life

79
Q

79 What process in plants releases oxygen?

A

photosynthesis

80
Q

80 What is the chemical test for oxygen?

A

relights a glowing splint

81
Q

81 The relighting of a glowing splint is the test for what gas?

A

oxygen

82
Q

82 Why did the formation of the Earth’s early oceans cause a decrease in atmospheric carbon dioxide concentrations?

A

the carbon dioxide dissolved in the water

83
Q

83 What do some sea creatures use dissolved carbon dioxide to help them do?

A

form shells

84
Q

84 What sort of chemical compound are shells made from: an oxide, a carbonate or a chloride?

A

carbonate

85
Q

85 What is the formula for calcium carbonate?

A

CaCO3

86
Q

86 What process in plants and algae causes a reduction of atmospheric carbon dioxide concentrations?

A

photosynthesis

87
Q

87 Photosynthesis affects the concentrations of two gases in the atmosphere – carbon dioxide, and what other gas?

A

oxygen

88
Q

88 Give the name of some of the earliest photosynthetic microorganisms.

A

cyanobacteria

89
Q

89 Certain gases in the atmosphere keep the Earth warm. What is this effect called?

A

greenhouse effect

90
Q

90 Give the name of one of the most common greenhouse gases.

A

carbon dioxide, methane, water vapour

91
Q

91 Name three greenhouse gases.

A

methane, carbon dioxide, water vapour, CFCs and many others

92
Q

92 Energy is transferred from the Sun by what?

A

infrared/electromagnetic) radiation/waves/light

93
Q

93 The warm Earth emits what type of electromagnetic waves?

A

infrared

94
Q

94 In an atmosphere containing greenhouse gases, what happens to some of the infrared waves that the Earth emits?

A

absorbed and re-emitted in all directions

95
Q

95 Why do modern thermometers give better quality evidence than those from the 18th century?

A

thermometers are now more accurate/have a better resolution

96
Q

96 What word beginning with c describes the way in which two variables appear to be linked because they show similar patterns of change?

A

correlation

97
Q

97 What term is used to describe the changes to average weather conditions around the world?

A

climate change

98
Q

98 Evidence for carbon dioxide variations over the last 800 000 years comes from Antarctica. In what form is this evidence?

A

ice cores

99
Q

99 What type of human activity has mainly increased the level of greenhouse gases since 1750?

A

burning fossil fuels

100
Q

100 The acidity of the oceans is increasing due to more carbon dioxide dissolving in the water. What is this doing to the pH of the oceans?

A

decreasing it/making it more acidic

101
Q

What is a hydrocarbon?

A

A compound that is made up of hydrogen and carbon only

102
Q

What is crude oil?

A

A mixture of different length hydrocarbons

103
Q

How do we seperate out the mixture of crude oil?

A

Fractional distillation

104
Q

During fractional distillation, cruide oil is heated until…

A

it is a gas

105
Q

Where does crude oil go once it has become a gas?

A

It goes into a condensing column

106
Q

Long chain hydrocarbons which don’t evaporate become…

A

residue

107
Q

The residue that is left during fractional distillation of crude oil because it doesn’t evaporate is…

A

bitumen

108
Q

What is bitumen used for?

A

Making roads

109
Q

It is very hot/cold at the bottom of the condensing column

A

hot

110
Q

As we move up the condensing tower, the temperature increases/decreases

A

decreases

111
Q

At different temperatures in a condensing column…

A

different length hydrocarbons come off

112
Q

Gases can be produced at the top/bottom of the condensing column

A

Top

113
Q

Gasoline and naptha are produced near the top/middle/bottom of a condensing tower

A

Top

114
Q

Kerosene is produced in the top/middle/bottom of a condensing tower

A

Middle

115
Q

Diesel and fuel oil are produced near the top/middle/bottom of a condensing tower

A

Bottom

116
Q

Short hydrocarbons come off at the top/bottom of a condensing tower

A

Top

117
Q

Long hydrocarbons come off at the top/bottom of a condensing tower

A

Bottom

118
Q

Things at the top of a condensing column are highly/not very flammable

A

highly

119
Q

Things at the bottom of a condensing column are highly/not very flammable

A

Not very

120
Q

Things at the bottom of a condensing column are very/not viscous

A

very

121
Q

Things at the top of a condensing column are very/not viscous

A

not

122
Q

True/False: Long hydrocarbons that come out of fractional distillation aren’t always the most useful

A

True

123
Q

From fractional distillation we get lots/few long hydrocarbons which are/aren’t very useful

A

lots, aren’t

124
Q

From fractional distillation we get lots/few short hydrocarbons which are/aren’t very useful

A

few, are

125
Q

How do we crack long hydrocarbons?

A

Heat and a catalyst

126
Q

What does cracking long hydrocarbons produce?

A

Alkenes and short alkanes

127
Q

Complete combustion of a hydrocarbon involves lots of…

A

oxygen

128
Q

Complete combustion of a hydrocarbon involves lots of oxygen, which is the _______ ____ flame on a bunsen burner

A

roaring blue

129
Q

What is the word equation for complete combustion?

A

Hydrocarbon + oxygen -> water + carbon dioxide

130
Q

What is incomplete combustion?

A

When there is not enough oxygen

131
Q

What colour flame on a bunsen burner is incomplete combustion?

A

Orange

132
Q

Incomplete combustion is more problematic because…

A

it produces carbon monoxide, which is highly toxic, and carbon

133
Q

What is the word equation for incomplete combustion?

A

Hydrocarbon + oxygen -> water + carbon dioxide + carbon monoxide + carbon

134
Q

What are the 3 main greenhouse gases?

A

Carbon dioxide, water vapour and methane

135
Q

Which greenhouse gas has the largest impact on the environment?

A

Carbon dioxide

136
Q

The bonds in carbon dioxide are really good at absorbing…

A

infrared/heat radiation

137
Q

Carbon dioxide absorbing infrared radiation means that it becomes trapped in our atmosphere and therefore…

A

warms the planet

138
Q

What does the warming of the planet as a result of infrared radiation being trapped in our atmosphere mean?

A

When heat and light energy from the sun comes to the earth it is usually reflected back by the earth and would normally go straight out into space, however it is being trapped by greenhouse gases and therefore staying in our atmosphere and heating it up

139
Q

We can see a gradual increase/decrease in the levels of carbon dioxide over time

A

Increase

140
Q

The levels of carbon dioxide have picked up speed/slowed down in recent years

A

picked up speed

141
Q

True/False: There is one thing that humans do which is the reason that the levels of carbon dioxide are increasing

A

False, there are lots of things which humans do that increase the levels of carbon dioxide

142
Q

True/False: Global warming means that everywhere is getting hotter

A

False, not everywhere is getting hotter

143
Q

What impact is global warming having on deserts and farmland?

A

They are drying out completely

144
Q

What impact is global warming having on ice poles?

A

The are melting

145
Q

Why is the fact that ice poles are melting as a result of global warming bad for polar bears?

A

They live on these blocks of ice and hunt in the water - then jump on the ice when they need a rest. Because the ice is melting, there is nowhere for polar bears to rest and therefore lots are drowning

146
Q

Ice caps melting leads to increased/decreased levels of flooding in other places

A

Increased

147
Q

Why does the melting of ice caps result in flooding in some areas?

A

The sea levels are rising

148
Q

If sea levels continue to rise then…

A

certain places, especially areas on the coast, will end up underwater

149
Q

Whilst Australia are having their hottest Christmases ever, the UK are having their…

A

coldest Christmases ever and seeing unpresidented levels of snow

150
Q

True/False: Climate change only effects people

A

False, it effects animals and plants aswell

151
Q

As temperature changes, top of mountains which perhaps used to be under snow is now available for…

A

Habitation by new animals and plants

152
Q

If you have a house on top of a mountain which you know is protected from certain types of animals because you know it is too cold or warm for them there, the changing climate could mean…

A

That this is not the same anymore as with the changing climate animals are moving up and down slopes as their habitats are changing

153
Q

Why do animals’ habitats change?

A

As temperature changes and as the location of their food source changes

154
Q

What is your carbon footprint?

A

How much carbon your daily activities contribute to the atmosphere

155
Q

What kind of things impact a person’s carbon footprint?

A

Whether you drive or walk to a destination, whether you eat food that is grown locally instead of food that has travelled a long distance, etc

156
Q

Give 2 examples of human activities that contribute to the production of carbon dioxide

A

Any 2 from burning fossil fuels for use as electricity, deforestation - cutting down trees so that the trees can’t take up carbon dioxide from the atmosphere anymore and our reliance on petrol cars

157
Q

The predictions for the levels of carbon dioxide in the atmosphere is that…

A

they are just going to increase

158
Q

The predictions for global warming in coming years is…

A

It is just going to increase

159
Q

How can we stop the levels of carbon dioxide and global warming increasing?

A

If we as a population decide to do something about it

160
Q

Sulfur dioxide is one of the _____ pollutants

A

major

161
Q

What happens when sulfur dioxide goes up into the atmosphere?

A

It dissolves in the clouds and comes back down as acid rain

162
Q

When sulfur dioxide goes up into the atmosphere, what does it come back down as?

A

Acid rain

163
Q

Acid rain has an effect on a small/wide range of things

A

wide

164
Q

True/False: Animals are immune to acid rain

A

False, acid rain will hurt animals that come into contact with it

165
Q

What will happen to fish and plants in a lake/ocean/pond if a it becomes too acidic?

A

They will start to die

166
Q

True/False: Acid rain can kill plants

A

True

167
Q

True/False: Acid rain will destroy limestone statues as they will dissolve in the acid rain

A

True

168
Q

What are the effects of too much carbon in the air?

A

It will lead to large levels of smog and global dimming

169
Q

Where is smog and global dimming as a result of too much carbon in the air often prevelant?

A

Developing countries

170
Q

True/False: Water vapour contributes to the warming of the planet

A

True

171
Q

True/False: Carbon dioxide is not toxic

A

False, it is toxic

172
Q

True/False: Nitrogen oxides contribute to acid rain and help prevent smog

A

False, they contribute to smog and acid rain

173
Q

The air we breathe is made up of one gas/lots of different gases

A

lots of different gases

174
Q

The air we breathe is predominantly ________ gas

A

nitrogen

175
Q

What percentage of the air we breathe is oxygen?

A

21

176
Q

True/False: There is a large number of other gases in the air besides oxygen and nitrogen, including a small amount of carbon dioxide

A

True

177
Q

What was the early atmosphere mainly formed from?

A

Things coming out of volcanoes

178
Q

True/False: In the earth’s early atmosphere there was a small amount of ammonia

A

False, there was a large amount of ammonia

179
Q

True/False: In the earth’s early atmosphere there was methane

A

True

180
Q

In the earth’s early atmosphere there was/wasn’t any water vapour in the air

A

was

181
Q

True/False: There was no carbon dioxide in the air in the earth’s early atmosphere

A

False, there was some

182
Q

Why would the earth’s early atmosphere not be a nice place to be?

A

Ammonia smells like old baby nappies and methane smells like farts

183
Q

Why did the levels of water vapour in the earth’s early atmosphere decrease?

A

It rained and therefore made the oceans

184
Q

Give 2 reasons why levels of carbon dioxide in the earth’s early atmosphere decreased?

A

Any 2 from it dissolved in oceans, turned into fossils and photosynthesis started to take place

185
Q

With the evolution of green plants, oxygen started to increase/decrease

A

increase

186
Q

Why did the levels of oxygen in earth’s early atmosphere start to increase?

A

Photosynthesis started to take place

187
Q
A

GCSE Combined Chemistry (Edexcel) (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions