The earth and its atmosphere

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1. why have carbon levels been increasing?

  • not enough trees are being grown to take in the carbon dioxide and release oxygen
  • modern machinery requires carbon to function
  • 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
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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
  • a heavy rock that comes from space
  • parts of the moon
  • unidentified rocks on earth

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

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 was earth's atmosphere like in the past?

  • there was very high levels of Nitrogen
  • the atmosphere was non-existent
  • the early atmosphere contained high levels of CO2
  • the early atmosphere contained high levels of O2


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