The Carbon Cycle

Front

The circulation of the element Carbon among Earth's atmosphere, land, oceans, and organisms is called _____________.

Back

the Carbon Cycle

Front

What is an essential element of all living creatures?

Back

Carbon

Front

Is the total amount of carbon on Earth constant?

Back

True

Front

Carbon is used in the process called __________ by plants and algae to make food and the building blocks for growth.

Back

photosynthesis

Front

Bacterias that decompose dead plants release _____________ back into the atmosphere. Options: water, nitrogen, oxygen, carbon

Back

carbon

Front

In the oceans; algae, plants, and other organisms use carbon from the atmosphere for ________________. Options: respiration, decomposition, transpiration, photosynthesis

Back

photosynthesis

Front

Organisms that die in the ocean may __________ to the bottom and form limestone rock over a period of time. Options: sink, float, rise, increase.

Back

sink

Front

Ocean coral and oysters use carbon to create _________. Options: oxygen, shells, leaves, food.

Back

shells

Front

Limestone is a type of rock created from the ______________ of dead sea organisms.

Back

shells

Front

Over ________________ of years, once-living matter that remains in the ground can transform into fossil fuels.

Back

millions