A type of bicycle

A scientific term for water

A series of events that happen repeatedly

A single event that does not repeat

The most abundant element in the universe

A type of cycle

A liquid element found only in the ocean

The fourth most abundant element in the universe and essential to life on Earth

Liquid - water (H2O)

Solid - diamonds

Solid - limestone (CaCO2)

Gas - carbon dioxide (CO2)

The sun and the heat of Earth's interior

The rotation of the Earth on its axis

Human activities alone

The moon's gravitational pull

Rocks turn into animals

Carbonic acid forms when atmospheric CO2 and water react

Carbon turns directly into oxygen

Plants absorb carbon from the soil

To swim faster in the ocean

To produce light in deep waters

To make shells of CaCO3

To create oxygen through respiration

Helium

Pure oxygen

Nitrogen

Carbon dioxide

It cools down the Earth's temperature

It breaks down rocks and minerals

It turns atmospheric CO2 into carbohydrates (sugars)

It releases carbon dioxide into the atmosphere

It turns into water

It disappears completely

It is used to make new plants

It enters soil as dead plant matter and is broken down by microorganisms

Geological, by about 1,000 times more than the biological cycle

Biological, by about 1,000 times more than the geological cycle

Neither cycle moves carbon

Both move equal amounts of carbon