Conditons for life on earth
- Created by: hannah kingham
- Created on: 18-11-15 13:46
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- Conditions for life on earth
- Position of Earth
- Titled orbit- seasonal changes
- Distance from sun- amount of insolation so control temperature and presence of liquid water
- Gravity- maintains atmosphere
- Gravitational attraction of moon and earth controls tides.
- Large amount of water
- Physiological solvent- most chemical reactions in cells take place in dissolved water
- transport- water is the solvent in the blood and sap. transports things like amino acids and oxygen.
- Anomalous expansion on freezing- Prevents lakes in cold weather from freezing etc.
- high specific heat capacity- moderates temperature changes
- Provision of aquatic habitats
- Appropriate temperature range
- most areas of earth are above 0 degrees which means liquid water remains presence.
- Enzymes tend to denature when above 40c
- Ambient gases
- used for photosynthesis etc.
- e.g. Co2 and Nitrogen
- Light and radiation from the sun
- Sunlight energy for photosynthesis
- Heat production when absorbed- warms earth
- Distance from sun- controls light levels
- Position of Earth
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