Evolution of the Earth's Atmosphere

Which gas makes up 78% of the Earth's Atmosphere?

• Nitrogen (N₂)

• Oxygen (O₂)

• Carbon Dioxide (CO₂)

• Water Vapour (H₂O)

• Argon (Ar)

Which gas makes up 21% of the Earth's Atmosphere?

• Nitrogen (N₂)

• Oxygen (O₂)

• Carbon Dioxide (CO₂)

• Water Vapour (H₂O)

• Argon (Ar)

Which planet was Earth's early atmosphere most like, with the high carbon dioxide?

• Venus

• Mercury

• Mars

• Jupiter

Reorder the following processes that lead to the modern atmosphere

• Carbon dioxide dissolved in the oceans and formed carbonates

• Ammonia reacted with oxygen, forming nitrogen and water

• Water vapour condensed and formed the oceans

• Plants and bacteria absorbed carbon dioxide in photosynthesis and released oxygen

• Volcanoes erupted releasing gases

Reorder the following changes in gas concentrations

• Water Vapour becomes liquid water so decreases

• High carbon dioxide and Water Vapour

• Carbon dioxide dissolves in oceans so decreases

• Oxygen released from plants and increase

• Carbon dioxide absorbed by plants and decreases

Why can we not be sure how the atmosphere formed

• The humans alive at the time are all dead now

• No one wrote down the information

• No humans were alive then and there isn't enough evidence

• The meteor killed all of the witnesses

The Earth's atmosphere started to form __.6 billion years ago

Plants produced oxygen through ​ (a)  

The equation for photosynthesis is:

​ (b)   + Water --> Oxygen + ​ (c)  

• photosynthesis
• Carbon Dioxide
• Glucose
• Respiration

Carbon dioxide decrease because plants carried out ​ (a)   . Then ​ (b)   ate the plants. When organisms dies their bodies may become ​ (c)   . This trapped the carbon dioxide for ​ (d)   of years.

• photosynthesis
• animals
• fossilised
• millions
• thousands
• frozen
• respiration