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The debris of boulders eroded and carried down by glaciers will eventually form moraines (mounds) where the front of the glacier melts and retreats, leaving the debris behind. Moraines can be high and wide enough to form a dam, behind which glacial melt water is trapped and lakes are formed.

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8y ago
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14y ago

They are called glacial erratics or glacial erratic boulders.

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9y ago

A large rock deposited by a glacier is a glacial erratic.

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13y ago

It is called an erratic.

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14y ago

Glacial erratics

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13y ago

Moraine or till.

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14y ago

Glacial erratics.

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Q: What are large deposits of boulders called?
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