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 c) evaporation d) eating 3) How the oceans formed a) Water evaporated as the Earth cooled b) Water vapour condensed as the Earth cooled c) Water evaporated as the Earth got hotter d) They have always been there 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) Two main gases in Earth's original atmosphere a) nitrogen and oxygen b) oxygen and carbon dioxide c) nitrogen and water vapour d) carbon dioxide and water vapour 7) Where most of the original carbon dioxide went a) Became dissolved in the oceans b) Was used by animals and plants for respiration c) Evaporated in to space d) Was eaten by plants 8) Amount of nitrogen in today's atmosphere a) 21% b) 78% c) 0.9% d) 0.04% 9) A process that uses oxygen and produces carbon dioxide a) photosynthesis b) respiration c) breathing d) distillation 10) Which of these did not remove carbon dioxide from the original atmosphere? a) photosynthesis b) formation of fossil fuels c) formation of sedimentary rocks d) dissolving in the ocean

Atmosphere

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