Early Conditions on Earth
- Created by: Brad_ers_B
- Created on: 03-05-14 13:17
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- Early conditions on Earth
- Large amounts of water
- Physiological solvent - most chmeical reactions in cells have water
- Transport - blood/sap. Transports oxygen, sugars ect.
- Temperature control - too hot = evaporation off skin, too cold = heat transported in blood
- Anomalous expansion on freezing - ice floats
- High specific heat capacity
- Provision of aquatic habitats
- Appropriate temperature range
- Above 0°C allowing liquid water
- Most living organisms found in 0°C to 40°C
- However thermeophilic bacteria can withstand high temps like over 80°C
- Light and radiation from the Sun
- Sunlight - photosynthesis
- Heat production when absorbed - sourve of energy for water cycle
- Little harmful UV and ionising radiation
- Distance - controls light levels and temps
- Daily rotation - controls day and night (temps)
- Tilted axis - seasons
- Molten layers beneath the crust - magnetic field
- Large amounts of water
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