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glacier 
Mass of ice resulting from the accumulation and compression of snow; it moves under its own weight.
terminal moraine
Frontal moraine marking the glacier’s most advanced position before it recedes.
rock basin
Basin dug out of soft rock by a glacier.
glacier tongue
River of ice formed by the flow of the firn.
riegel
A rocky ridge set crosswise to the glacier tongue.
crevasse
Deep narrow fissure that forms on the surface of the glacier.
ground moraine
Deposit of rock debris (till) that is dragged along and deposited under the advancing glacier.
end moraine
Deposit of rock debris scraped from the ground and pushed to the front of the glacier.
outwash plain
Relatively even, gently sloping tract of land, formed by the action of a glacier’s meltwater.
meltwater
Water that runs beneath the glacier tongue, forming rivers and occasionally lakes at the foot of a glacier.
lateral moraine
Deposit of rock debris scraped from the sides of raised land by ice.
serac
Chaotic mass of unstable ice bordered by crevasses.
hanging glacier
Glacier with no tongue that remains in its cirque.
glacial cirque
Semicircular cavity with steep sides, carved out by ice.
firn
Accumulation of snow inside a cirque; compressed by its own weight, it is converted into ice and feeds the glacier.
bergschrund
Crevasse between the firn and the rock face; it appears when the glacier breaks away from the rock face.
