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 Photolysis

• The oxygen left inside of people after they have been buried in the ground gets absorbed by the soil.

• The chemical decomposition 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.