1. what is the Miller-Urey Experiment?
- 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 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 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
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2. 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
3. why have carbon levels been increasing?
- 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
- not enough trees are being grown to take in the carbon dioxide and release oxygen
- modern machinery requires carbon to function
4. 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
5. what causes the motion of the plates?
- the plates move because of huge forces caused by convection currents
- the plates move because are slowly breaking up
- the plates move because the ocean slowly pushes them
- the plates move because of the rotation of the earth