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Explanation:

1. There are three main types of glacial erosion - plucking, abrasion and freeze thaw.

2. A nunatak is the summit or ridge of a mountain that protrudes from an ice field or glacier that otherwise covers most of the mountain or ridge. They are also called glacial islands. Examples are natural pyramidal peaks.

3. A lateral moraine forms along the sides of a glacier. As the glacier scrapes along, it tears off rock and soil from both sides of its path. This material is deposited as lateral moraine at the top of the glacier's edges. Lateral moraines are usually found in matching ridges on either side of the glacier

4. These scratches, "striations," can be used to understand past ice flow. ... Over time, the glacier moves over rock and sediment, leaving striations or striae, on the rock surfaces that can reveal the direction that the glacier was flowing

5. They form in bowl-shaped depressions, also known as bedrock hollows or cirques, located on the side of, or near mountains. They characteristically form by the accumulation of snow and ice avalanching from upslope areas

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