oxygen cycle

How does oxygen move

It circulates through the ecosystem and biosphere

Who uses oxygen

Living organism

Who are the main source of oxygen

Photosynthetic organisms are the main source of oxygen

How do plants make oxygen

Use carbon dioxide and processes of photosynthesis to form carbs and oxygen

How does respiration work

Animals and plants absorb O2 to break down carbs into CO2 and water

How do decomposers uses oxygen

To decompose organic matter and release CO2

Where does water go in water

O2 is dissolved into water, aquatic organisms use O2 for respiration and decomposition and release CO2 into water

where is a large part of the earth O2 found

Rocks

What forms surface weathering

O2 combines with silicon and iron in rocks to form silicate and iron oxide (rust)

what do lichens do

Break down rocks over thousands of years (weathering) and release nutrients and O2 for living organism