Earth's atmosphere

The original atmosphere of the Earth was created by volcanoes and consisted mainly of which gas?

• Oxygen

• Water vapour

• Nitrogen

• Carbon dioxide

The original atmosphere of the Earth was created by volcanoes, which of the following gases was there none of in the early atmosphere?

• Oxygen

• Methane

• Nitrogen

• Carbon dioxide

Mars and Venus have atmospheres like that of the early Earth. Which gas are their atmosphere's mostly made from?

• Nitrogen

• Carbon dioxide

• Methane

• Water vapour

Explain how and why the level of carbon dioxide in the Earth's early atmosphere dropped significantly.

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Explain how and why the level of oxygen in the Earth's atmosphere increased significantly about 2.7 billion years ago.

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Which is the following statements is NOT true?

• The atmosphere is about one fifth oxygen

• The atmosphere contains small amounts of water vapour and noble gases

• The atmosphere is about 80% oxygen

• The atmosphere is about four fifths nitrogen

Earths atmosphere today contains about __% oxygen

Which statement explains why there is little evidence for the Earth's early atmosphere?

• There was nobody alive then

• The time scale is 4.6 billion years ago

• There are no written records

• The atmosphere has changed a lot since then

Which of the following lists contains three greenhouse gases?

• Methane

  Nitrogen

  Oxygen

• Water vapour

  Methane

  Carbon dioxide

• Methane

  Carbon dioxide

  Nitrogen

• Carbon dioxide

  Oxygen

  Water vapour

Which is the correct equation for photosynthesis?