1) How do scientists believe the atmosphere was formed 4.6 billion years ago? a) Volcanoes erupted 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 (O2) & Water vapor (H2O) b) Carbon dioxide (CO2) & Oxygen (O2) c) Carbon dioxide (CO2), Methane (CH4) & Water vapor (H2O) d) There were no gases 3) Why did the levels of Oxygen increase in the atmosphere? a) More volcanoes erupted b) Algae and green plants evolved and it made by photosynthesis oxygen by photosynthesis c) It came from the water 4) What are the most abundant gases in the atmosphere today? a) Carbon dioxide (CO2) & Water vapor (H2O) b) Carbon dioxide (CO2) & Methane (CH4) c) Oxygen (O2) & Nitrogen (N2) 5) Which of these is not true: a) CO2 was dissolved in the oceans b) CO2 was trapped in sedimentary rocks c) CO2 was trapped in fossil fuels d) O2 was released by volcanoes e) CO2 was locked up by photosynthesizing algae and green plants 6) When the Earth cooled to below 100 degrees Celsius - a) water vapor turned into ice b) water vapor condensed to form the oceans c) water vapor dissolved d) water vapor turned to nitrogen gas 7) Methane (CH4) and Ammonia (NH3) were -  a) were very useful gases in the early atmosphere b) not very harmful gases c) toxic gases (deadly) in the early atmosphere 8) Today, the amount of Nitrogen (N2) in the atmosphere is -  a) 78% b) 21% c) 0.9% d) 0.04% 9) Today, the amount of Oxygen (O2) in the atmosphere is - a) 0.04% b) 0.9% c) 21% d) 78% 10) Today, the amount of carbon dioxide (CO2) in the atmosphere is about - a) 78% b) 21% c) 0.9% d) 0.04%

Composition of Earth's Atmosphere

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