z1.06 Unit 1 Test MOD 25-26

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This is a diagram of the carbon cycle.

Label the arrows with the processes they represent.

The gases that make up Earth's atmosphere have changed over time. Scientists measure the levels of carbon dioxide (CO2) in Earth's atmosphere.

The simplified Carbon Cycle Model shows locations where carbon is stored and processes that move carbon from one location to another.
Scientists can use carbon cycle models to help make predictions about the amounts of carbon in different locations.

Use this Carbon Cycle Model to identify all the processes that would decrease CO2 in the atmosphere if the rates of these processes were to increase.

photosynthesis

fossil fuel combustion

diffusion in the ocean

diffusion in the atmosphere

Which carbon compound is considered a greenhouse gas?

calcium carbonate (CaCO3)

glucose (C6H12O6)

carbon dioxide (CO2)

What effect has the increasing amounts of carbon compounds in the atmosphere had on the Earth?

Increasing fossil fuel production

Decreasing average temperatures

Rising average temperatures

Which carbon compound is used to build the shells of sea creatures?

calcium carbonate (CaCO3)

glucose (C6H12O6)

carbon dioxide (CO2)

Which process does NOT release carbon into the atmosphere?

Respiration

Photosynthesis

Combustion

What happens in a carbon sink?

Carbon is permanently stored

More carbon is released than absorbed

More carbon is absorbed than released

Give 1 example of a carbon sink.

What happens in a carbon source?

Carbon is permanently stored

More carbon is released than absorbed

More carbon is absorbed than released

Carbon remains constant

Give 1 example of a carbon source.

How do heterotrophs obtain the carbon compounds they need?

Eating plants (or animals that eat plants)

Photosynthesis

Burning fossil fuels

What process releases carbon into the atmosphere from fossil fuels?

Combustion

Respiration

Photosynthesis

What determines if the carbon cycle is in balance?

When carbon movement into the atmosphere equals movement out

When all reservoirs contain equal amounts of carbon

When carbon only moves in one direction

Which natural process adds CO2 to the atmosphere from Earth's interior?

Earthquakes

Volcanic eruptions

Ocean currents

When do atmospheric CO2 levels typically begin to decrease?

Spring

Fall

Winter

Why does atmospheric CO2 typically decrease during the season you selected in the previous question?

There are fewer plants performing photosynthesis and using carbon

Animals breathe more and produce more carbon

There are more plants performing photosynthesis and using carbon

What is happening to the Amazon rainforest's role as a carbon sink?

It's becoming a carbon source

It's becoming more efficient

It's remaining stable

Decomposing plant and animal matter __________ the amount of carbon in the soil.

Thawing permafrost is releasing carbon that was stored in frozen soil. What type of forest is permafrost found in?

Boreal

Tropical

Temperate

Carbon dioxide (CO2) in the atmosphere is...

natural

caused by human activities

both of the above

In your own words, how does cutting down trees affect the amount of carbon in the atmosphere?

The gases that make up Earth's atmosphere have changed over time.  Scientists measure the levels of carbon dioxide (CO2) in Earth's atmosphere.  

The simplified Carbon Cycle Model shows locations where carbon is stored and processes that move carbon from one location to another.
Scientists can use carbon cycle models to help make predictions about the amounts of carbon in different locations. 

Use this Carbon Cycle Model to identify all the processes that would decrease CO2 in the atmosphere if the rates of these processes were to increase.

photosynthesis

fossil fuel combustion

diffusion in the ocean

diffusion in the atmosphere

Which carbon compound is considered a greenhouse gas?

calcium carbonate (CaCO3)

glucose (C6H12O6)

carbon dioxide (CO2)

What effect has the increasing amounts of carbon compounds in the atmosphere had on the Earth?

Increasing fossil fuel production

Decreasing average temperatures

Rising average temperatures

Which carbon compound is used to build the shells of sea creatures?

calcium carbonate (CaCO3)

glucose (C6H12O6)

carbon dioxide (CO2)

Which process does NOT release carbon into the atmosphere?

Respiration

Photosynthesis

Combustion

What happens in a carbon sink?

Carbon is permanently stored

More carbon is released than absorbed

More carbon is absorbed than released

What happens in a carbon source?

Carbon is permanently stored

More carbon is released than absorbed

More carbon is absorbed than released

Carbon remains constant

How do heterotrophs obtain the carbon compounds they need?

Eating plants (or animals that eat plants)

Photosynthesis

Burning fossil fuels

What process releases carbon into the atmosphere from fossil fuels?

Combustion

Respiration

Photosynthesis

What determines if the carbon cycle is in balance?

When carbon movement into the atmosphere equals movement out

When all reservoirs contain equal amounts of carbon

When carbon only moves in one direction

Which natural process adds CO2 to the atmosphere from Earth's interior?

Earthquakes

Volcanic eruptions

Ocean currents

When do atmospheric CO2 levels typically begin to decrease?

Spring

Fall

Winter

Why does atmospheric CO2 typically decrease during the season you selected in the previous question?

There are fewer plants performing photosynthesis and using carbon

Animals breathe more and produce more carbon

There are more plants performing photosynthesis and using carbon

What is happening to the Amazon rainforest's role as a carbon sink?

It's becoming a carbon source

It's becoming more efficient

It's remaining stable

Thawing permafrost is releasing carbon that was stored in frozen soil.  What type of forest is permafrost found in?

Boreal

Tropical

Temperate

Carbon dioxide (CO2) in the atmosphere is...

natural

caused by human activities

both of the above