1) How do scientists believe the atmosphere was formed 4.6 billion years ago? a) volcanoes errupted and gave out gases b) The gases already existed c) The gases were made by chemical reactions 2) Which gases were the most abundant in the early atmosphere? a) Oxygen & Water Vapour b) Caron Dioxide & Oxygen c) Carbon Dioxide & Methane 3) How were levels of Carbon dioxide reduced in the early atmosphere? a) trapped in dead plants & animals, turned into fossil fuels b) Plants gave out carbon dioxide c) It was removed by chemical reactions 4) Why did the levels of Oxygen increase in the atmosphere? a) More volcaoes errupted b) Algae eveolved and it make oxygen by photosynthesis c) It came from the water 5) What are the most abundant gases in the atmosphere today? a) Carbon Dioxide & Water Vapour b) Carbon Dioxide & Methane c) Oxygen & Nitrogen 6) Which of the following is a greenhouse gas? a) Oxygen b) Carbon Dioide c) Nitrogen

Earths Atmosphere

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