79389
Description
Mind Map by elliehaf11, updated more than 1 year ago
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Created by elliehaf11
over 11 years ago
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How the presence of
life on Earth brought
about environmental
change
- ATMOSPHERIC
OXYGEN
- Oxygen is a reactive
element, concentration
declined when it reacted
with other elements eg)
oxidation weathering
- Continued presence of
oxygen in atmosphere relies
on processes that replace it
as other processes remove it
- Small amount of
oxygen released by
photolysis of water and
photosynthetic 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
not possible
so early
organisms
lived in
oceans
where water
protected
them from
UV light
- Before this
abundant life
not possible
so early
organisms
lived in
oceans
where water
protected
them from
UV light
- Allowed ozone layer to form,
provided protection from UV
light to living organisms.
- Oxygen absorbed UV
light from sun, oxygen
molecules then split,
produced monatomic
oxygen which reacts with
diatomic oxygen to
produce O3/Ozone
- Oxygen is a reactive
element, concentration
declined when it reacted
with other elements eg)
oxidation weathering
- ATMOSPHERIC
CARBON DIOXIDE
- Naturally
released into
atmosphere
by volcanoes
- Essential greenhouse gas,
helps maintain heat in
atmosphere, without it Earth
would be too cold to sustain life
- Excessive CO2
levels would cause
temperatures to
rise too high for
life to survive
- Light output of the sun
increases by 10% every
billion years so 30% brighter
than when life first developed
- Living organisms helped maintain
suitable atmospheric temperatures by
removing CO2 (photosynthesis) and
storing in fossil fuels and carbonate
rocks (chalk/limestone)
- Naturally
released into
atmosphere
by volcanoes
- THE
HYDROLOGICAL
CYCLE
- Heat energy from absorbed
sunlight causes water in the
sea to evaporate
- May be carried over
land where it falls as rain
then flows back to 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 is
unavoidable as the stomata must
open for gas exchange
- Heat energy from absorbed
sunlight causes water in the
sea to evaporate
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