The Earth's atmopshere: The Atmosphere.

Question 1

What is the percentage of nitrogen in the atmopshere today?

Answer 1

• 78%.

Question 2

What is the percentage of oxyegn in the atmopshere today?

Answer 2

• 21%.

Question 3

What is the other small percentage?

Answer 3

• Other gases.
• Co2.
• Water Vapour.
  Noble gases.

Question 4

What was the Earth’s early atmosphere like? - Similar to Mars and Venus

Answer 4

• Intense volacanic activity + released the gases formed the atmosphere.
• water vapour: Earth cooled down the water vapour condensed to form oceans.
• Huge Amounts of co2 so the Earth mostly vonsisted of co2 with little oxygen.
• Nitrogen: Gradually built up in the atmosphere.
• Small amounts of methane and ammonia.

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Question 5

How did the changes to the Earth’s atmosphere happen?

Answer 5

• Water Vapour condensed to form oceans.
• Co2 was dissolved into the oceans to form weak acid + reacted with minerals in the sea to form precipitates.
• Formed sendiments of carbonated rock on sea bed.
• Some co2 was used to make corals and shells of organisms + when these died they formed sentimendary rock limestone.
• Photosynthetic algae evolved in the ocean, which produces oxygen and takes in the co2.
• To some point the oxygen where animals could evolve.
• Carbon can be trapped in fossil fuels.

Question 6

How did the changes to the Earth’s atmosphere happen?

Answer 6

• Water Vapour condensed to form oceans.
• Co2 was dissolved into the oceans to form weak acid + reacted with minerals in the sea to form precipitates.
• Formed sendiments of carbonated rock on sea bed.
• Some co2 was used to make corals and shells of organisms + when these died they formed sentimendary rock limestone.
• Photosynthetic algae evolved in the ocean, which produces oxygen and takes in the co2.
• To some point the oxygen where animals could evolve.
• Carbon can be trapped in fossil fuels.