Glaciers and Ice Caps

Select all of the answers that apply. How do glaciers move? Gravity pulls them downhill. Gravity pushes them uphill. Melted ice allows the glacier to slide forward.

Gravity pulls them downhill. Melted ice allows the glacier to slide forward.

How much of Earth's freshwater is locked away in glaciers and ice caps? 3% 25% 50% 70%

70%

Which of the following statements is true? Moraines form when glaciers pick up large rocks. Plucking happens when glaciers deposit rock and sediment. Since 1979, the polar ice caps have grown in size about 20%. Older glaciers have longer ice crystals than younger ones.

Older glaciers have longer ice crystals than younger ones.

Global warming _____. is not a problem for people who don't live in the Arctic causes the sea to rise, which can contaminate freshwater sources only affects glaciers in tropical regions near the equator can't be stopped

causes the sea to rise, which can contaminate freshwater sources

The Arctic ice cap _____. is thicker than the Antarctic ice cap covers most of the land at the South Pole floats on top of the Arctic Ocean is located at the southernmost point on Earth

floats on top of the Arctic Ocean

Glaciers _____. form when snow stays in the same place for a long time cover about 5% of Earth's land can only exist in cold regions near the poles contain about 70% of Earth's saltwater

form when snow stays in the same place for a long time

Kettle lakes form when _____. it rains over a glacier sediment is deposited by a glacier ice chunks break off a glacier, then melt rivers flow into a melting glacier

ice chunks break off a glacier, then melt

firn

intermediate stage between snow and ice

moraine

large area of rock and sediment left by a glacier

ice cap

large, dome-shaped mass of ice

Older glaciers have (longer-thinner-shorter) ice crystals than younger glaciers.

longer