791708
Description
Mind Map by rache11ouise, updated more than 1 year ago
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Created by rache11ouise
about 10 years ago
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How The Presence Of Life On
Earth Brought Environmental
Change
- Atmospheric Oxygen
- Oxygen is a reactive element,
concentration declined when it reacted with
other elements e.g. oxidisation weathering
- Continued presence of
oxygen in the atmosphere
replies on processes that
replace it as others remove it
- Small amount of
oxygen released by
photolysis of water
and photosynthetic
of bacteria
- Oxygen absorbed UV
light from sun, oxygen
molecules then split,
produced monatomic
oxygen which reacts with
diatomic oxygen to
produce O3/ozone
- Allowed ozone layer to form provided
protection from UV light to living
organisms
- Before this abundant life was not possible
so early organisms lived in the oceans
where water protected them from UV light
- Before this abundant life was not possible
so early organisms lived in the oceans
where water protected them from UV light
- Allowed ozone layer to form provided
protection from UV light to living
organisms
- Oxygen is a reactive element,
concentration declined when it reacted with
other elements e.g. oxidisation weathering
- Carbon Dioxide
- Naturally released into the
atmosphere by volcanoes
- Excessive CO2
in atmosphere
would cause
temperature to
rise too high for
life to survive
- Essential greenhouse
gas helps to maintain
heat without it Earth
would be too cold to
sustain life
- Living organisms helped maintain
sustainable atmospheric temperature by
removing CO2 (photosynthesis) and storing
fossil fuels and carbonate rocks
(chalk/limestone)
- Light output by the sun
increases by 10% every
billion years so 30%
brighter than when life
was first developed
- Naturally released into the
atmosphere by volcanoes
- Hydrological Cycle
- Heat energy from absorbed
sunlight causes water in the
sea to evapourate
- May be carried over land where it
falls as rain then flows back to the
sea
- Most rain falls relatively close to the
coast but transpiration by plants returns
water vapour to the atmosphere so it can
be blown further inland
- Transpiration from
leaves in
unavoidable as the
stomata must open
for gaseous
exchange
- Transpiration from
leaves in
unavoidable as the
stomata must open
for gaseous
exchange
- Most rain falls relatively close to the
coast but transpiration by plants returns
water vapour to the atmosphere so it can
be blown further inland
- May be carried over land where it
falls as rain then flows back to the
sea
- Heat energy from absorbed
sunlight causes water in the
sea to evapourate
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