The Early & Changing Atmosphere

How did volcanic activity change the Earth’s early atmosphere?

• Released large amounts of gases such as carbon dioxide and water vapor

• Released large amounts of gases such as oxygen

• Released large amounts of gases such as carbon dioxide, water vapour and oxygen

• Released very little amounts of carbon dioxide

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What did iron pyrite tell us about how much oxygen there was in the earth’s early atmosphere?

• Lots of oxygen

• Little or no CO2

• Little or no O2

• It contained iron

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How are oceans formed?

• The Earth cooled down causing the water vapor in the atmosphere to condense to liquid water

• The Earths temperature increased causing the water vapor in the atmosphere to condense to liquid water

• The Earths temperature increased causing the water vapor in the atmosphere to evaporate

• The Earth cooled down causing plants to photosynthesis

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Why did the amount of carbon dioxide in the atmosphere decrease?

Choose 2

• Carbon-dioxide is breathed in by animals

• Organisms used carbon dioxide to photosynthesise

• Some CO2 dissolved in the oceans and is used by marine creatures to form shells made from CaCO3 (Calcium carbonate)

• Plants started to photosynthesis and released carbon dioxide

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This gas was in high concentrations in the developing atmospheres and later dissolved into rainwater, added to the oceans, then settled to the bottom of the ocean. 

• oxygen
• carbon dioxide
• argon
• water vapor

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The composition of todays atmosphere is mostly...

• Hydrogen

• Oxygen

• Nitrogen

• Helium

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How much oxygen do we have in todays atmosphere?

• 78%

• 21%

• 33%

• 40.2%

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What produced oxygen within the early stages of our atmosphere?

• Plants

• Volcanos

• Galactic Debris

• Cyanobacteria

What was the Earth's early atmosphere like ?

• Similar to Mars and Venus. A large amount of carbon dioxide,little or no oxygen small amounts of other gases, such as ammonia and methane

• Similar to Mercury. A large amount of oxygen, sodium and hydrogen.

• Similar to Jupiter. A large amount of hydrogen and helium.

• Similar to Pluto. A large amount of nitrogen.

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What organisms do scientists think evolved first?

• Bacteria & algae

• Fish & grass

• Birds & trees

• Humans & animals

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