Oxygen Cycle

What does an "exchange of gases" mean?

• It means that gases are apart of everything. 

• It means that orange juice is an upside down milkshake with a missing tail.

• It means that humans and plants trade gases back and forth.

• It means that carbon in apart of all living things. 

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NGSS.MS-LS2-3

Is our oxygen cycle balanced? How do you know? Explain.

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NGSS.MS-LS2-3

Explain one way in which the oxygen cycle could become off balance.

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What other element cycle is the oxygen cycle most interconnected with?

• nitrogen cycle

• carbon cycle

• water cycle

• element cycle

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Which of the following processes produces oxygen in the oxygen cycle?

• respiration

• decomposing

• oxidation

• sunlight

Oxygen is constantly being used and created by different processes on planet Earth.

• True

• False

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NGSS.MS-LS2-3

________________ are the main creators of oxygen in the atmosphere.

• Plants

• Animals

• Robots

• Soils

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NGSS.MS-LS1-6

What is the primary source of oxygen in the Earth's atmosphere?

• Photosynthesis by plants

• Respiration by animals

• Combustion of fossil fuels

• Volcanic eruptions

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Which process in the oxygen cycle involves the conversion of oxygen into carbon dioxide?

• Photosynthesis

• Respiration

• Combustion

• Decomposition

How do oceans contribute to the oxygen cycle?

• By absorbing oxygen from the atmosphere

• By releasing oxygen through phytoplankton photosynthesis

• By storing oxygen in deep sea currents

• By converting oxygen into carbon dioxide

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