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