The earth and its atmosphere

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

  • oxygen, nitrogen and carbon dioxide
  • oxygen, hydrogen and carbon dioxide
  • carbon, oxygen and carbon monoxide
  • nitrogen, oxygen and hydrogen
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2. 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

3. what is the Miller-Urey Experiment?

  • 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
  • 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 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 is a fissure in a planet's surface from which geothermally heated water issues.

4. what is continental drift?

  • continental drift is when heat release from radio active processes cause convection currents
  • continental drift is a fissure in a planet's surface from which geothermally heated water issues
  • continental drift is a theory that suggests the original molecules of life formed within clay
  • continental drift is a solid piece of debris from a source such as an asteroid or a comet

5. what causes the motion of the plates?

  • the plates move because of huge forces caused by convection currents
  • the plates move because the ocean slowly pushes them
  • the plates move because of the rotation of the earth
  • the plates move because are slowly breaking up

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