Basically it's a river just like any other so what it does is erode a channel through the mountains. Thing is, instead of making a "V" shaped valley like a liquid river would, a glacier makes a "U" shaped valley. When the glacier retreats, the steep slopes collapse pretty readily so you get landslides everywhere. Alternatively, if the sea rises, the valley forms a fiord (ala Milford Sound in New Zealand).
they keep ripping the bottom of the earth as they move
The glacier scrapes the surface of the earth as it advances, then deposits that till at its terminus when it melts.
they affect by the sand
they obviously destroy things...
The tectonic plates combined together
The Earth may shift downward and may cause great damage.
It blocks (some of) it from reaching the surface of the Earth.
Hydrosphere
Hydrosphere
About 50 m do love the glacier surface
100
70% or 80% of water covers the earths surface