Weathering Environments Part 3: Glacial Processes

The video discusses the formation and movement of glaciers, their impact on landscapes, and the types of sediments they produce. It covers the history of the Laurentide ice sheet, the formation of glacial till and moraines, and the creation of glacial lakes and outwash deposits. The video also explores how glacial sediments affect soil quality and the role of climate change in glacier melting.

What percentage of Earth's freshwater is stored in glaciers?

• Over 30%

• Over 70%

• Over 60%

• Over 50%

How do glaciers primarily alter the landscape during their expansion?

• By depositing sediments

• By melting rapidly

• By forming lakes

• By eroding bedrock

What is basal till?

• Sediment on top of the glacier

• Sediment at the bottom of the glacier

• Sediment carried by wind

• Sediment in proglacial lakes

How is ablation till formed?

• By sediment falling on top of the glacier

• By sediment being carried by subglacial streams

• By sediment being eroded from bedrock

• By sediment being deposited in lakes

What are moraines?

• Large piles of sorted sediments

• Large piles of poorly sorted sediments

• Large piles of rounded sediments

• Large piles of chemically weathered sediments

What is a characteristic of glacial outwash deposits?

• They are nutrient-rich

• They are chemically weathered

• They are well-rounded

• They are poorly drained

Why do glacial sediments generally make poor soils?

• They are hard and compacted

• They are too chemically weathered

• They are too nutrient-rich

• They are too well-drained