Cycles Review

Which of the following is a direct human activity that increases carbon dioxide levels in the atmosphere?

• Photosynthesis

• Burning fossil fuels

• Ocean absorption

• Volcanic eruptions

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DOK Level 1: Recall

Identify the process by which plants remove carbon dioxide from the atmosphere.

• Respiration

• Combustion

• Photosynthesis

• Decomposition

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DOK Level 1: Recall

Explain how deforestation can impact the carbon cycle.

• It increases the amount of carbon stored in trees.

• It decreases the amount of carbon dioxide in the atmosphere.

• It reduces the number of trees available to absorb carbon dioxide, increasing atmospheric CO2 levels.

• It has no impact on the carbon cycle.

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DOK Level 2: Skill/Concept

Describe one way in which human activities can alter the natural carbon cycle.

• By increasing the rate of photosynthesis in plants

• By reducing the amount of carbon stored in fossil fuels through extraction and combustion

• By decreasing the amount of carbon dioxide in the atmosphere

• By increasing the natural decomposition rate of organic matter

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DOK Level 2: Skill/Concept

What is the primary greenhouse gas released by human activities that affects the carbon cycle?

• Methane

• Nitrous oxide

• Carbon dioxide

• Water vapor

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DOK Level 1: Recall

How does the burning of fossil fuels contribute to the carbon cycle?

• It decreases the amount of carbon in the atmosphere.

• It releases stored carbon into the atmosphere as carbon dioxide.

• It increases the carbon stored in the ocean.

• It has no effect on the carbon cycle.

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DOK Level 2: Skill/Concept

Which human activity is most responsible for the increase in atmospheric carbon dioxide over the past century?

• Industrial agriculture

• Deforestation

• Fossil fuel combustion

• Urbanization

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DOK Level 1: Recall

If there are 200 sources of carbon and 120 sinks what is the carbon flux?

• 100

• 80

• 60

• 40

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NGSS.MS-ESS2-1

NGSS.MS-LS2-3

We call things that put carbon INTO the atmosphere _______ and we call things that take carbon OUT of the atmosphere _____.

What does too much nitrogen in an ecosystem cause?

• Algal blooms where plants overgrow in water

• Not enough food for animals

• Fossil fuel combustion

• Deforestation of trees

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NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4