8.19-8.26 Earth and The Early Atmosphere

Question 1

What released gases that formed Earth’s early atmosphere?

Answer 1

Intense volcanic activity

Question 2

What 4 things was Earth’s early atmosphere though to contain?

Answer 2

.Little or no oxygen
.A large amount of CO2
.Water Vapour
.Small amounts of other gases

Question 3

How were oceans formed?

Answer 3

Water vapour condensed to form oceans

Question 4

What happened to CO2 and Carbonates when oceans formed?

Answer 4

CO2 dissolved in the water and carbonates were precipitated producing sediments, reducing the CO2 in the atmosphere

Question 5

How and What produced the oxygen that is in todays atmosphere?

Answer 5

Algae and Plants by photosynthesis

Question 6

Describe the chemical test for oxygen

Answer 6

.Use a glowing splint and insert it into a test tube, if it relights oxygen is present

Question 7

How does the greenhouse affect work?

Answer 7

Various gases including Carbon dioxide, methane, and water vapour absorb heat radiated from the Earth subsequently releasing energy which keeps the Earth warm

Question 8

What bit of evidence is used for human activity and climate change+Evaluate it

Answer 8

.The correlation between the change in atmospheric carbon dioxide concentration, the consumption of fuels and temperature changes
.The uncertainties caused by the location where these measurements are taken and historical accuracy

Question 9

Give two examples of human activity that release carbon dioxide and methane

Answer 9

.Driving
.Consuming electricity
.Raising livestock
.Decay of organic waste in landfill sites

Question 10

Human activities have increased the amount of which two gases?

Answer 10

Carbon dioxide and Methane