z1.06 Unit 1 Test 25-26

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8

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.

Which carbon compound is considered a greenhouse gas?

calcium carbonate (CaCO3)

methane (CH4)

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

Decreasing fossil fuel production

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

glucose (C6H12O6)

carbon dioxide (CO2)

calcium carbonate (CaCO3)

methane (CH4)

Which process does NOT release carbon into the atmosphere?

Respiration

Photosynthesis

Combustion

Decomposition

What happens in a carbon sink?

Carbon is permanently stored

More carbon is released than absorbed

More carbon is absorbed than released

Carbon remains constant

Give 2 examples of carbon sinks.

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 2 examples of carbon sources.

How do heterotrophs obtain the carbon compounds they need?

Burning fossil fuels

Chemical weathering

Photosynthesis

Eating plants (or animals that eat plants)

What process releases carbon into the atmosphere from fossil fuels?

Respiration

Decomposition

Photosynthesis

Combustion

What determines if the carbon cycle is in balance?

When carbon movement into the atmosphere equals movement out

When plants stop absorbing carbon

When carbon only moves in one direction

When all reservoirs contain equal amounts of carbon

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

Volcanic eruptions

Earthquakes

Ocean currents

Wind patterns

When do atmospheric CO2 levels typically begin to decrease?

Spring

Summer

Fall

Winter

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

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

It's remaining stable

It's storing double the carbon

It's becoming a carbon source

It's becoming more efficient

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?

Temperate

Rain forest

Boreal

Tropical

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

natural

caused by human activities

both of the above

neither of the above

In your own words, explain how deforestation is affecting the carbon cycle.

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.

fossil fuel combustion

diffusion in the ocean

diffusion in the atmosphere

photosynthesis

cellular respiration

Which carbon compound is considered a greenhouse gas?

calcium carbonate (CaCO3)

methane (CH4)

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

Decreasing fossil fuel production

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

glucose (C6H12O6)

carbon dioxide (CO2)

calcium carbonate (CaCO3)

methane (CH4)

Which process does NOT release carbon into the atmosphere?

Respiration

Photosynthesis

Combustion

Decomposition

What happens in a carbon sink?

Carbon is permanently stored

More carbon is released than absorbed

More carbon is absorbed than released

Carbon remains constant

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?

Burning fossil fuels

Chemical weathering

Photosynthesis

Eating plants (or animals that eat plants)

What process releases carbon into the atmosphere from fossil fuels?

Respiration

Decomposition

Photosynthesis

Combustion

What determines if the carbon cycle is in balance?

When carbon movement into the atmosphere equals movement out

When plants stop absorbing carbon

When carbon only moves in one direction

When all reservoirs contain equal amounts of carbon

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

Volcanic eruptions

Earthquakes

Ocean currents

Wind patterns

When do atmospheric CO2 levels typically begin to decrease?

Spring

Summer

Fall

Winter

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

It's remaining stable

It's storing double the carbon

It's becoming a carbon source

It's becoming more efficient

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

Temperate

Rain forest

Boreal

Tropical

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

natural

caused by human activities

both of the above

neither of the above