Carbon Cycle

A carbon store is a natural or artificial sink that accumulates and stores carbon-containing chemical compounds.

• phytoplankton

• soil and organic matter

• ocean surface

Processes move carbon from one form to another. Which of the following is a process?

• vegetation

• rock formation

• coal, oil, gas

Where does the carbon cycle begin?

• atmosphere

• ocean surface

• cycles do not have a defined beginning point

Which of the following carbon stores holds the most carbon?

• atmosphere

• sediments and sedimentary rock

• coal, oil, gas

Where is carbon dioxide removed from the atmosphere? (SELECT ALL)

• photosynthesis

• oceanic CO2 exchange

• deep ocean currents

Most of the mass of the trees around us comes from

• CO2 in water

• atmospheric CO2

• CO2 released by decomposers

The amount of carbon in the atmosphere is

• increasing

• decreasing

• staying the same

What pushes limestone rock to the surface where it can be weathered?

• the rock cycle

• formation into gas and oil

• tectonic Earth movements

Phytoplankton act as a carbon store when they

• breathe in CO2

• die and become a food source for other creatures

• die and move down to the deepest part of the ocean

Soil erosion carries carbon compounds from the land to the ocean. What other process does the same thing?

• sediments and sedimentary rock formation

• vegetation growth

• weathering and run-off