Option A is correct, the highest elevation in this terminal moraine traced is 1030 ft. The lowest elevation at Blue Spring Lake is 820 ft. So, the thickness of the ice is about 200 ft.
A terminal moraine, also known as end moraine, is a type of moraine that bureaucracy on the terminal (facet) of a glacier, marking its maximum enhancement. At this point, debris that has accumulated via plucking and abrasion has been driven by way of the front edge of the ice, is driven no similarly, and as a substitute is deposited in an unsorted pile of sediment. because the glacier acts very just like a conveyor belt, the longer it remains in a single location, the more the quantity of material to be deposited. The moraine is left because of the marking factor of the terminal extent of the ice.
As a glacier moves along its course, the encompassing place is continuously eroding. unfastened rock and pieces of bedrock are constantly being picked up and transported with the glacier. fine sediment and debris also are incorporated into the glacial ice. the build-up of these rocks and sediment together shapes what's known as glacial till when deposited.
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