The earth and its atmosphere

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1. what are meteorites?

  • parts of the moon
  • 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
  • a heavy rock that comes from space
  • unidentified rocks on earth
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2. what is the Miller-Urey Experiment?

  • the aim was to see if substances now made by living things could be formed in the conditions thought to have existed on the early earth.
  • the Miller-Urey experiment is a fissure in a planet's surface from which geothermally heated water issues.
  • the Miller-Urey experiment tested to see if life began in a pond or ocean as a result of the combination of chemicals from the atmosphere and some form of energy to make amino acids
  • the Miller-Urey experiment suggested that the original molecules of life formed with clay that, as it crystallizes, sticks together, is capable of bringing in more clay and thus start a mechanism for selecting materials

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

  • a heated gap in the sea filled with water
  • 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 deep gap in the sea floor
  • a place where only some animals can live

4. what happens at plate boundaries?

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

5. explain how the atmosphere has changed to contain oxygen

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

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