Conditions For Life
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5 physical features of earth that’s needed for life?
Mass, distance from sun, axis of rotation, speed of rotation,magnetic field
Where is earth in space that makes it right for life?
Habitable zone
What other name is earth known as (perfect conditions)
Goldilocks planet
Why is liquid water needed for life? 7
High specific heat capacity, temperature regulation, expansion while frozen, provides habitats, absorbs uv radiation, transport, physiological solvent
What is earths temperature range
Mostly 0-35 degrees Celsius
Why is earths temperature range so important for life? 4
Liquid water, regulates atmospheric circulation, doesn’t denature enzymes, doesn’t immobilise enzymes
How is solar insolation important for life on earth? 4
Visible light for photosynthesis, energy for the water cycle, ocean current circulation, albedo affect
What is the albedo affect?
On a lighter surface, energy is reflected: on a darker surface, energy is absorbed
How much light is absorbed while land isn’t covered in snow and ice?
94%
Why is mass of earth important for life?
Large enough to prevent important gases from escaping Atmospheric pressure can keep water as a liquid
Why is distance from sun important for life?
Light/energy from the sun can produce a temperature suitable for life Allows for liquid water
Why is axis of rotation important for life?
Varyied amounts of sunlight throughout the year creates “seasonal variation” Diurnal cycle can control temperature
How is speed of rotation important for life?
24 hour cycle stops extreme temperature change
How is magnetic field important for life?
Deflects solar wind preventing biologically harmful radiation from reaching earth
How is earth magnetic field form?
Molten layers beneath the crust combined with the rotation of earth.
How was the ozone layer formed?
Chemical reactions between oxygen and uv, ozone = o3
Why is the ozone layer important?
Protects earth from solar radiation
Why is biochemical cycles important?
Prevents build up of waste and prevents shortages of recourses. Recycles elements