Unit 4B: Glaciers and Deserts Slides

Multiple Choice

Which of the following best describes a glacier?

• A massive, long-lasting moving accumulation of ice and snow that forms only on land

• A large body of water that freezes in winter and melts in summer

• A mountain covered with snow all year round

• A river that flows through icy regions

Multiple Select

Which of the following are characteristics of alpine glaciers?

• Occur only in polar regions

• Usually colder and wetter

• Often constrained to valley channels

• Growth depends on temperature and precipitation

Fill in the Blank

The accumulation of ice that spreads outward in all directions is known as a(n) ___.

Multiple Choice

Which of the following best describes how crevasses form in glaciers?

• They form in the lower plastic zone of the glacier.

• They form only in the brittle upper 40 meters of t
• They form due to melting at the glacier's surface.

• They form at the glacier terminus.

Open Ended

Explain the difference between the zone of accumulation and the zone of ablation in a glacier.

Multiple Choice

Which landform is created when glaciers erode three or more cirques into different sides of a peak?

• Arête

• Horn

• Cirque

• Valley glacier

Multiple Choice

Which of the following best describes how a hanging valley forms?

• A small glacier joins a much larger one, leaving a valley hanging above the main valley.

• A river carves a deep channel through a mountain range.

• A glacier deposits sediments at the base of a mountain.

• A valley is flooded by incoming seas as glaciers melt.

Labelling

Label the glacier diagram correctly.

Drag labels to their correct position on the image

Cirque

Arete

U-shaped valley

Hanging valley

Horn

Fill in the Blank

Drift is an all-embracing term for sediments of glacial origin, no matter how the sediment was ___.

Multiple Choice

Which type of moraine forms at the greatest advance of a glacier before it begins to retreat?

• Terminal moraine

• Lateral moraine

• Medial moraine

• Ground moraine

Multiple Choice

Which type of moraine forms when two alpine glaciers converge and their lateral moraines merge in the middle of the resulting larger glacier?

• Medial moraine

• Terminal moraine

• Lateral moraine

• Ground moraine

Multiple Select

Which of the following are characteristics of drumlins?

• Elongated, tear-shaped hills

• Form near the terminus of a glacier

• Composed of sorted and stratified sediments

• Slope more gently on one side

Fill in the Blank

Large blocks of stagnant ice that melt and leave behind depressions are called ___.

Multiple Choice

What are the main conditions required for glaciers to form?

• Glaciers form only on land where the amount of snow that falls exceeds the amount that melts.

• Glaciers form in the ocean where icebergs accumulate.

• Glaciers form in deserts where sand turns into ice.

• Glaciers form only during winter when temperatures drop below freezing.

Multiple Choice

A place that gets little to no rain, is usually flat and has no vegetation.

• Forest

• Valley

• Canyon

• Desert

Multiple Choice

What is the rainshadow effect?

• When the mountains block the passage of rain-producing weather systems and cast a "shadow" of dryness behind them.

• When it does rain for many years

• When it rains and is sunny at the same time

Multiple Choice

Sand dunes are are a result of a powerful force of erosion. What is this force?

• Sun

• Wind

• Rain