Climate Change and Its Impacts Practice Quiz

By how much has Earth’s global temperature increased since the 1800s?

• 0.5°C

• 1.1°C

• 2.0°C

• 3.5°C

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Why do even small temperature increases cause ice to melt faster?

• Because the sun is stronger

• Because ice reflects less light

• Because small shifts disrupt the balance of melting and freezing

• Because ice becomes denser

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What risks does sea level rise create for coastal cities?

• More jobs for lifeguards

• Flooding and infrastructure damage

• Taller buildings

• Colder winters

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Who are climate refugees and why might they have to move?

• People who love warm weather

• People forced to leave due to rising seas

• Scientists studying glaciers

• Tourists visiting islands

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Why doesn’t melting sea ice significantly raise sea levels?

• Because it melts too slowly

• Because it floats and already displaces water

• Because it’s made of salt

• Because the ocean absorbs it instantly

How does melting land ice in Greenland and Antarctica affect sea levels?

• It lowers sea levels

• It raises sea levels by adding new water

• It freezes ocean water

• It doesn’t affect sea levels

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What is basal melting and how does it happen?

• Ice melting at the surface from sunlight

• Ice melting at the bottom from warm water

• Ice melting from rain

• Ice melting from pressure of glaciers

Why does warm, salty water cause glaciers to melt faster?

• Salt dissolves the ice

• It is denser and seeps under glaciers

• It makes glaciers lighter

• It freezes more quickly

What are greenhouse gases, and which one is most responsible for warming?

• Gases that cool Earth; oxygen

• Gases that trap heat; carbon dioxide

• Gases from volcanoes; sulfur dioxide

• Gases in the ocean; methane only

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How do fossil fuels contribute to Earth’s changing energy balance?

• They remove greenhouse gases

• They add carbon dioxide that traps more heat

• They make Earth reflect more sunlight

• They cool the upper atmosphere

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