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1. Amount of glacial drift: When ground moraine is too much the glacier glides over it leaving it behind.

2. Weight of glacier: When more ice is added to a stationary glacier pressure is exerted at the base causing melting and the material which was embedded in the ice is dropped.

3. Climatic change: During summer and spring ice melts depositing some materials the glacier was carrying.

4. Friction beneath the ice: Friction between ice and surface reduces ice speed causing heavy materials to be deposited beneath ice sheets.

5. Slope: Lowlands allow glacier to accumulate a lot of materials which are finally deposited by melting ice.

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