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The Oxygen Cycle
Sydney Jarrett and
Samantha Ost
Photosynthesis
• The process by which light energy is
converted to chemical energy
Weathering
• Physical and
chemical
process in
which solid
rock exposed
at earths
surface is
changed to
separate solid
particles and
dissolved
materials
Respiration & Decay
• Mechanisms
in which
animal life
and bacteria
consume
oxygen and
release
carbon
dioxide
Burial
• The oxygen
left inside of
people after
they have
been buried
in the
ground gets
absorbed by
the soil.
Photolysis
• The
chemical
decompositi
on of
materials
under the
influence of
light
Plants
• The oxygen cycle starts
off in plants.
• Plants use
photosynthesis to
produce
carbohydrates and oxygen
• Plants “breathe” in carbon
dioxide and “breathe” out
oxygen
Water
• When the water in a steam enters a pond,
microorganisms in the pond begin to break down
organic matter, consuming oxygen in the process.
Organism
• Last in the cycle are
the organisms
• Their role in the
cycle begins with
carbon dioxide in
the atmosphere.
• Animals breathe that
oxygen and both
plants and animals
use the sugars for
energy.