As the glacier melts and becomes water,
it does not have the force to carry the large
rocks which it leaves behind in the form of
huge rugged boulders. Smaller particles and
pebbles are left on the bed of the glacier. The
glacier brings small pebbles, cobbles, sand
etc. with it. All these debris, known as till,
are acquired by the glacier from mountainous
slopes, side valley, floors etc. The till which
cannot be carried by a glacier is deposited
around various parts of the glacier. The
deposition of this till is called moraines.
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