1. C1Quiz 1
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2. Question 1
What is the approximate percentage of oxygen in Earth’s modern day atmosphere? A
78% B 50 C
21% D 99

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4. Which gas has the largest percentage in Earth’s modern day atmosphere?
Question 2
Which gas has the largest percentage in Earth’s modern day atmosphere? A
Nitrogen B
Carbon Dioxide C
Water Vapour D
Oxygen

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6. Which gas made up the majority of the Earth’s early atmosphere?
Question 3
Which gas made up the majority of the Earth’s early atmosphere? A
Methane B
Hydrogen C
Sulphur Dioxide D
Carbon Dioixde

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8. Question 4
Where is much of the gas that once made up the Earth’s early atmosphere now located? B
It has been pumped underground and trapped inside the Earth’s core. A
It condensed to form large deposits of ‘dry ice’. C
It dissolved in oceans and was then taken up by marine organisms. D
It collected in the Earth’s upper atmosphere and compacted together.

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10. Question 5
What is the approximate fraction of carbon dioxide currently found in the atmosphere? A
1 / 2500 B
1 / 5000 C
1 / 100 D
1 /

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12. Question 6
Which of the following activities is not a human activity that causes small changes to the atmosphere over time? A
Deforestation B
Burning Fossil Fuels C
Farming D
Volcanic Eruptions

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14. Question 7
Which one of the following processes was responsible for increasing the amount of oxygen in the atmosphere over time? A
Respiration B
Photosynthesis C
Burning Fossil Fuels D
Deforestation

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16. Question 8 A B C D Which gas do plants take out of the atmosphere?
Nitrogen B
Oxygen C
Carbon Dioxide D
Methane

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18. Question 9
Which of the following gases are released by volcanoes? A
Oxygen and Nitrogen B
Carbon Dioxide and Hydrogen C
Oxygen only D
Carbon Dioxide and Steam

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20. Question 10
Which of the following gases could be released when fossil fuels are burned? A
Carbon Dioxide and Oxygen B
Carbon Dioxide and Carbon Monoxide C
Ammonia and Nitrogen D
Nitrogen and Oxygen

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22. Congratulations!
Well done!!!