Formation of Earth's Atmosphere (AQA GCSE Chemistry): Flashcards

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Evolution of the atmosphere
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When algae first appeared

2.7 billion years ago

Process started by algae that changed atmosphere

Photosynthesis

Gas photosynthesis takes in

Carbon dioxide (CO2CO_2)

Gas photosynthesis releases

Oxygen (O2O_2)

Effect of photosynthesis on CO2CO_2 levels

Decreased (went down)

Effect of photosynthesis on O2O_2 levels

Increased (went up)

Time after algae appeared before animals could evolve

1 billion years

What coal is formed from

Dead plants

What crude oil & natural gas formed from

Dead sea creatures

What crude oil & natural gas contain

Hydrocarbons

How CO2CO_2 moves from air into oceans

CO2CO_2 dissolves in seawater

What sea creatures use dissolved CO2CO_2 for

Making shells and skeletons

Rock formed from dead sea creature shells

Limestone

Form of carbon locked in limestone

Calcium carbonate

Photosynthesis equation

6CO2+6H2O→C6H12O6+6O26CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2

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Formation of Earth's Atmosphere

CO₂ & CH₄ as Greenhouse Gases

Causes of Atmospheric Pollution

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Formation of Earth's Atmosphere

CO₂ & CH₄ as Greenhouse Gases

Causes of Atmospheric Pollution

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Formation of Earth's Atmosphere

CO₂ & CH₄ as Greenhouse Gases

Causes of Atmospheric Pollution

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Formation of Earth's Atmosphere

CO₂ & CH₄ as Greenhouse Gases

Causes of Atmospheric Pollution

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