1) Amount of carbon dioxide in today's atmosphere a) 0.9% b) 21% c) 0.04% d) 78% 2) A process that uses carbon dioxide and produces oxygen a) photosynthesis b) respiration 3) How the oceans formed a) Water evaporated as the Earth cooled b) Water vapour condensed as the Earth cooled 4) Amount of oxygen in today's atmosphere a) 78% b) 21% c) 0.9% d) 0.04% 5) Where the Earth's original atmosphere came from a) oceans b) volcanoes c) earthquakes d) space 6) Amount of argon in today's atmosphere a) 0.04% b) 21% c) 78% d) 0.9% 7) Not a greenhouse gas a) Methane b) Water vapour c) Carbon dioxide d) Ozone 8) Where most of the original carbon dioxide went a) Became dissolved in the oceans b) Was used by animals and plants for respiration 9) Amount of nitrogen in today's atmosphere a) 21% b) 78% c) 0.9% d) 0.04% 10) A process that uses oxygen and produces carbon dioxide a) photosynthesis b) respiration

Earth's early atmosphere

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