Chapter 6 Test

The carbon cycle is a model that describes how carbon moves naturally through Earth’s systems. Carbon is present in the atmosphere as carbon dioxide gas.  What effect does deforestation have on the amount of carbon in the atmosphere?

• It decreases the amount.

• It increases the amount.

• It has no effect on the amount.

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NGSS.MS-LS1-6

The Sun is the most important influence on Earth’s climates. Suppose a meteor crashes into Earth’s surface and sends tons of pulverized rock material up into the atmosphere. How does this event interfere with the amount of solar energy that reaches Earth’s surface?

• 
  It can block incoming solar energy and make the air cooler.

• It can block incoming solar energy and make the air warmer.

• It can attract more sunlight and make the daytime hours brighter.

• It can attract more sunlight and create more hours of daylight.

The graph shows changes in global greenhouse gas levels over time. Which human activity causes these changes?

• composting trash

• burning fossil fuels

• planting trees

• recycling metals

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NGSS.MS-ESS3-5

NGSS.MS-ESS3-4

Carbon is present in all living things on Earth. It continuously cycles through Earth’s systems through natural and human-caused processes.

The figure shows the carbon cycle. Numbers 1 through 6 show different stops along the carbon cycle. Which step is incorrect?  

• Plants conduct photosynthesis and take in oxygen from the air.

• Animals breathe in oxygen and release carbon dioxide into the air.

• Waste products from animals use oxygen to decompose and release carbon dioxide into the air.

• Rain removes carbon dioxide as it falls through the air.

• Oceans come into contact with the air right above, absorbing carbon dioxide.

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

The figure shows the four ocean currents that make up the North Atlantic Gyre. The currents flow clockwise around the gyre. How would the climates along the coasts of North America and Africa change if the gyre rotation changed directions?

• The climate along the east coast of North America would become cooler, and the climate along the northwest coast of Africa would become warmer.

• The climate along the east coast of North America would become cooler, and the climate along the northwest coast of Africa would not change.

• The climate along  the east coast of North America would not change, and the climate along the northwest coast of Africa would become warmer.

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NGSS.MS-ESS2-6

When a volcano erupts, it releases water vapor into the air. Water vapor is considered a greenhouse gas. Why is this so?

• 
  It helps to keep the temperature of Earth’s atmosphere warm.

• It causes the temperature of Earth’s atmosphere to become cold.

• It has no effect on the temperature of the atmosphere.

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NGSS.MS-ESS2-4

Carbon is present in Earth’s atmosphere as carbon dioxide gas.  The zigzag pattern in the figure shows that the amount of carbon dioxide in the atmosphere changes throughout the year.

What causes this change to happen?

• Plants are dormant during the winter and growing during the summer.

• Many animals hibernate during the winter and are active during the summer.

• The number of daylight hours is shorter during the winter and longer during the summer.

• 
  The air temperature is lower during the winter and higher during the summer

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NGSS.MS-LS1-6

NGSS.MS-LS2-3

The graph shows changes in global greenhouse gas levels over time. Which statement describes the data in the graph?

• Levels of carbon dioxide are rising, and levels of nitrous oxide and methane have decreased.

• Levels of carbon dioxide and nitrous oxide are rising, and levels of methane have decreased.

• 
  Levels of carbon dioxide, nitrous oxide, and methane have decreased.

• Levels of carbon dioxide, nitrous oxide, and methane are rising.

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NGSS.MS-ESS3-5

Identify which of the two adds carbon dioxide to the air and which removes it from the air please.

a

b

Adds Carbon Dioxide to the air

Removes Carbon Dioxide from the air

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NGSS.MS-LS1-6

The graph shows changes in levels of atmospheric carbon dioxide over time. Which statement about the data in the graph is true? Select two correct answers.

• Levels of atmospheric carbon dioxide are the highest in 400,000 years

• Levels of atmospheric carbon dioxide are the lowest in 400,000 years.

• Levels of atmospheric carbon dioxide have remained steady over time

• Levels of atmospheric carbon dioxide fluctuate over geologic time

• Levels of atmospheric carbon dioxide are currently falling.

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NGSS.MS-ESS3-5