Moraine

Long Island, a large island off the coast of New York and Connecticut, is a terminal moraine.

the hills around this lake are all part of a terminal moraine.

A moraine is an accumulation of a mixture of material moved by a glacier.

Moraines consist of silt, clay, sand, gravel and rocks, all gathered from different locations the glacier crossed. Different parts of a moraine may consist of different proportions of the basic ingredients.

Terminal moraines form at the greatest extent of a glacier, ploughed up like a snow-plow.

Other moraines form when a glacier starts to melt, released silt, clay, sand, gravel and rocks that had been frozen within. Melting water carries the released material to a lower point on the glaciers surface. And, once the glacier has fully melted away, there is a pile of glacially carried material.