What Are Glaciers ?

What is the main difference between alpine glaciers and continental glaciers?

• Alpine glaciers are found in mountain ranges, while continental glaciers are found in large unconfined ice sheets.

• Alpine glaciers are smaller in size, while continental glaciers are larger in size.

• Alpine glaciers move faster than continental glaciers.

• Alpine glaciers are formed from compressed snow, while continental glaciers are formed from frozen water bodies.

What percentage of the Earth's land surface is covered by ice in 2021?

• 20%

• 15%

• 10%

• 5%

How do glaciers influence the global climate?

• By reducing the Earth's albedo

• By increasing the greenhouse effect

• By reflecting solar radiation

• By absorbing solar radiation

What percentage of the Earth's freshwater is locked in glaciers?

• 20%

• 10%

• 30%

• 40%

When did the most recent ice age start?

• 3.5 to 4.0 million years ago

• 2.5 to 3.0 million years ago

• 4.5 to 5.0 million years ago

• 1 to 1.5 million years ago

What is the lowest elevation where there's ice and snow all year round called?

• Frost line

• Snowline

• Ice line

• Glacier line

At what depth does the ice in a glacier become plasticky and can glide over each other?

• 30 meters

• 10 meters

• 40 meters

• 20 meters

How do glaciers move when they flow through a valley?

• They leave behind erratic boulders in the valley

• They form tarns at the foot of the valley

• They create lateral moraines along the valley walls

• They erode the valley walls and deepen the valley into a V-shape

What is the iconic image of the Alps that is the work of glaciers?

• Eiger

• Mont Blanc

• Matterhorn

• Jungfrau

What is the potential impact of the Thwaites Glacier breaking?

• Raise global sea levels by over 1 meter

• Raise global sea levels by over 0.5 meters

• Raise global sea levels by over 2 meters

• Raise global sea levels by over 3 meters