The earth and its atmosphere

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1. what are the 3 main gases in our atmosphere today?

  • oxygen, hydrogen and carbon dioxide
  • oxygen, nitrogen and carbon dioxide
  • nitrogen, oxygen and hydrogen
  • carbon, oxygen and carbon monoxide
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2. what is the carbon cycle?

  • the carbon cycle shows how carbon reacts with different metals
  • the carbon cycle shows how carbon is moved from place to place around the earth
  • the carbon cycle shows how the body releases carbon dioxide
  • the carbon cycle shows how volcanoes are created

3. why have carbon levels been increasing?

  • the burning of fossil fuels is adding carbon dioxide to the atmosphere faster than it can be removed. This means that the level of carbon dioxide in the atmosphere is increasing, contributing to global warming.
  • there are too many people being born causing more carbon dioxide to be released into the atmosphere
  • not enough trees are being grown to take in the carbon dioxide and release oxygen
  • modern machinery requires carbon to function

4. what happens at plate boundaries?

  • there is no way of telling where the boundaries are
  • various natural disasters
  • at the plate boundaries there tends to be volcanoes and earthquakes occurring due to the movement of the plates
  • there are huge ravines where the plates have moves away from each other

5. what are deep sea vents? (hydrothermal vents)

  • a hydrothermal vent is a fissure in planet's surface from which geothermally heated water issues. hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart, ocean basins and hotspots.
  • a place where only some animals can live
  • a deep gap in the sea floor
  • a heated gap in the sea filled with water

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