in forming the great lakes, glaciers:
_a. melted in upstream rivers and streams.
_b. forced the earh's crust upward
_c. carved basins out of bedrock
_d. froze the topsoil
the answer is C. I just read the article:)
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Yes, C is correct.
The correct answer is option _c. carved basins out of bedrock.
Glaciers played a significant role in shaping the Great Lakes. They were responsible for creating the basins or depressions where water collected to form the lakes. Here's a step-by-step breakdown of how glaciers carved the basins out of bedrock:
1. Glacial Formation: Glaciers are formed from layers of snow that accumulate over thousands of years. The weight of the snow compresses the lower layers into ice.
2. Movement: Due to gravity, glaciers slowly move downhill. As they move, they exert immense pressure on the land beneath them.
3. Erosion: While the glaciers move, they act as powerful bulldozers, picking up rocks, soil, and debris in the process. The glacial ice scrapes, plucks, and grinds the bedrock beneath.
4. Glacial Striations: The movement of the glacier over the bedrock creates deep grooves and scratches, known as glacial striations. These striations reveal the direction in which the glacier moved.
5. Plucking: Glaciers also have the ability to pluck large chunks of rock from the bedrock as they glide over it. This process occurs when the glacier freezes onto a piece of rock and effectively tears it away when it moves.
6. Formation of Basins: Over millions of years, the repeated erosion caused by the moving glacier slowly carves out the bedrock, forming deep basins. These basins are then filled with water, ultimately creating the Great Lakes.
So, in summary, glaciers carved basins out of bedrock, which eventually formed the Great Lakes.