Gases in the Air

Question 1

78%

Answer 1

Nitrogen

Question 2

21%

Answer 2

Oxygen

Question 3

1%

Answer 3

Argon, Water Vapour and Carbon Dioxide

Question 4

Traces of

Answer 4

Neon, Methane and Nitrate Oxide

Question 5

Scientists believe that the Earth was formed about

Answer 5

4.5 billion years ago

Question 6

Its early atmosphere was probably formed from the gases given out by …

Answer 6

volcanos

Question 7

The early atmosphere was probably mostly …?

Answer 7

Carbon Dioxide with little or no oxygen

Question 8

The Earth’s atmosphere today contains around … Oxygen and … Carbon Dioxide

Answer 8

21% , 0.04%

Question 9

How did the proportion of carbon dioxide in the atmosphere go down, and the proportion of oxygen go up?

Answer 9

Plants and algae can carry out photosynthesis

Question 10

What processes also absorb carbon dioxide from the atmosphere?

Answer 10

dissolving in the oceans, the production of sedimentary rocks such as limestone, the production of fossil fuels from the remains of dead plants and animals

Question 11

What is adding carbon dioxide to the atmosphere faster than it can be removed

Answer 11

burning of fossil fuels (coal and oil)

Question 12

the level of carbon dioxide in the atmosphere is increasing results in?

Answer 12

global warming

Question 13

Global warming is leading to?

Answer 13

Oceans becoming more acidic as they dissolve increasing amounts of carbon dioxide

Question 14

It also means that marine life …?

Answer 14

Are making the shells of sea creatures thinner than normal

Question 15

Carbo Dioxide levels were also reduced by the production of …. Rocks

Answer 15

Sedimentary

Question 16

Carbon dioxide levels increased because of the production of … from dead plants and animals

Answer 16

Fossil fuels

Question 17

Dissolvig into the …

Answer 17

Ocean