Unit 1 & 2: Carbon Cycle

Photosynthesis removes carbon dioxide from the atmosphere and uses it to make _____.

organic compounds

When oceanic organisms die they decompose and become carbon-rich organic matter that deposits on the ocean floor through a process called _____________.

sedimentation

_____ are the organisms that produce their own organic compounds using carbon dioxide from the air.

Autotrophs

The cycle that is critical for the formation of organic compounds is the _______ cycle.

Carbon

Where does the carbon dioxide we exhale come from?

Carbon dioxide is a product of cellular respiration.

The carbon dioxide is released when limestone is heated during the production of _____.

Cement

Burning organic material(s) such as _____, releases carbon dioxide.

Fossil fuels

When volcanoes erupt, they give off carbon that is stored in the _____.

Mantle

Cold ocean water ______________ carbon from the atmosphere while warm ocean water ______________ it.

Stores, releases

When organisms decay, decomposers also release carbon dioxide _________.

back into the atmosphere

______ is released back to the atmosphere in the form of carbon dioxide when animals exhale.

carbon

The ______ is the process through which carbon is recycled through living organisms, the atmosphere, and other parts of the biosphere.

carbon cycle

The burning of fossil fuels releases which of the following gases into the atmosphere?

carbon dioxide

What is the greatest source of carbon that enters the ocean from the atmosphere?

carbon dioxide

Which of the following is a greenhouse gas?

carbon dioxide

Carbon in the atmosphere exists primarily as ________.

carbon dioxide gas

Carbon dioxide enters the atmosphere from several different sources. These include:

cellular respiration, burning fossil fuels, rising ocean temperatures, decomposition

Which of the following are fossil fuels?

coal, oil, and natural gas

Burning of organic matter releases carbon dioxide into the atmosphere. This process is known as ___________.

combustion

What type of actions will release carbon dioxide into the atmosphere?

cutting down trees, burning tree fossils and woods

When organisms die, what process returns their carbon back into the atmosphere?

decomposition

During the carbon cycle, carbon is stored either in the atmosphere or in living organisms.

false

People are able to make the carbon they need for their cells.

false

The carbon in the oceans is present only in inorganic form as ions.

false

The __________ pathway involves the formation of sedimentary rock from insoluble carbon compounds.

geological

The increase of carbon dioxide in the atmosphere is contributing to a global rise in Earth's temperature, known as

global warming

Which equation depicts cellular respiration?

glucose + oxygen → carbon dioxide + water

Because increased carbon in the atmosphere traps heat in the Earth's atmosphere, it intensifies the ____________ effect.

greenhouse

In the organic pathway of the carbon cycle, phototrophs take in oxygen from the atmosphere to create organic compounds that are then consumed by __________.

heterotrophs

A tree is responsible for converting carbon dioxide in the atmosphere into organic molecules that can be used by itself and other organisms.

true

Carbon is necessary for living organisms to make organic compounds.

true

Carbon is the cornerstone of organic compounds, the compounds necessary for life.

true

Forests remove carbon from the atmosphere.

true

The carbon cycle passes through both biotic (living) and abiotic (non-living) components of the Earth.

true

The compound calcium magnesium carbonate is present in solid state in shells and sedimentary rocks.

true