U-shaped valleys provide evidence of which process?(1 point)
Responses
glacial erosion
glacial erosion
coastal erosion
coastal erosion
deposition
deposition
wind erosion
glacial erosion
What is the process of wearing rocks down into smaller pieces and then taking them away called?(1 point)
Responses
condensation
condensation
deposition
deposition
weathering
weathering
erosion
erosion
Which landform is evidence of erosion by waves on rocky coasts?(1 point)
Responses
shallow ponds
shallow ponds
sea arches
sea arches
sand dunes
sand dunes
U-shaped valleys
sea arches
What is the name of the landform remaining after a sea arch collapses?(1 point)
Responses
sea cliff
sea cliff
hoodoo
hoodoo
sea stack
sea stack
canyon
sea stack
Which landform is evidence of wind erosion?(1 point)
Responses
hoodoos
hoodoos
sand dunes
sand dunes
Grand Canyon
Grand Canyon
U-shaped valleys
hoodoos
U-shaped valleys provide evidence of glacial erosion.
To understand why U-shaped valleys are evidence of glacial erosion, let's break down the reasoning:
1. Glacial erosion: Glacial erosion is the process by which glaciers shape the land by the movement and grinding of ice over the Earth's surface. Glaciers have tremendous power to reshape landscapes, carving out valleys as they move downhill.
2. Valley formation: Valleys can be formed by water erosion or glacial erosion. However, U-shaped valleys specifically indicate the role of glaciers. U-shaped valleys have distinct characteristics that differentiate them from V-shaped valleys formed by rivers. Unlike rivers, which typically create V-shaped valleys through down-cutting, glaciers create wider, deeper, and more rounded valleys.
3. Glacier movement: Glaciers are large masses of ice that slowly move down slopes due to gravity. As glaciers move, they exert immense pressure and force on the surrounding rocks and sediment. This constant grinding action of rocks against the valley walls and floor causes the distinctive U-shape.
4. Glacial deposition: While glaciers primarily erode the land, they also transport and deposit rocks and sediment during their movement. However, deposition is not responsible for the formation of U-shaped valleys. Deposition occurs when a glacier retreats, leaving behind moraines, till, and other glacial sediment features.
Therefore, based on the unique characteristics of U-shaped valleys, the process that provides evidence for their formation is glacial erosion.