What happens to the Material if it either Overloads the Glacier, or the Ice Melts?

-Material is Deposited on the Floor of the Valley, leading to Moraines and Drumlins -These Deposits aren't really Arranged in Size and Weight, but however the Finer Material Spreads out into the Valley via Melt Water Streams. This actually sorts out the Material by Size, and in Layers. Found in the Front of the Glacier