The earth and its atmosphere

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1. what are meteorites?

  • a meteorite is a solid piece of debris from a source such as an asteroid or a comet, which originates in outer space and survives its impact with the earth's surface. it is called a meteoroid before its impact, a meteorite's size can range from S-XL
  • unidentified rocks on earth
  • a heavy rock that comes from space
  • parts of the moon
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2. explain how the atmosphere has changed to contain oxygen

  • life evolved to form single-celled organisms which started to photosynthesise
  • trees grew and produced oxygen
  • oxygen was suddenly released from within the earth
  • natural disasters eventually created oxygen

3. 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

4. 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

5. 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

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