Question

Glacial deposits are part of the land that is now Canada and the northern United States. How did these deposits form?

Answer 1

They are from material carried along by a glacier, and dropped out of it as it melts.

Explanation:

As the description implies, they are "deposits" from a glacier. As a glacier is built up and moves, it carries along with it a lot of material that may have fallen into it, or been ground up and pushed along with it. When the leading edge of a glacier recedes the material does not go back with it, as the recession is due to melting.

Thus the material in the glacier drops out - gets 'deposited' - wherever it is. Significant land features like moraines are one of the results of glacial deposition. The material originally came from anywhere along the glaciers path, from its origins to its leading edge.