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- 1. Multiple Choice
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
- 2. Multiple Choice
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
- 3. Multiple Choice
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
- 4. Multiple Choice
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
- 5. Multiple ChoiceThis 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.oxygencarbon dioxideargonwater vapor
- 6. Multiple Choice
The composition of todays atmosphere is mostly...
Hydrogen
Oxygen
Nitrogen
Helium
- 7. Multiple Choice
How much oxygen do we have in todays atmosphere?
78%
21%
33%
40.2%
- 8. Multiple Choice
What produced oxygen within the early stages of our atmosphere?
Plants
Volcanos
Galactic Debris
Cyanobacteria
- 9. Multiple Choice
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.
- 10. Multiple Choice
What organisms do scientists think evolved first?
Bacteria & algae
Fish & grass
Birds & trees
Humans & animals
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