the study of ice and its impact on the environment.
The Ice Age in Britain lasted from about one million years
ago to about 20 000 years ago. During that time the Northern
and Eastern parts of the British Isles were covered in ice.
Glaciers were formed which move down valleys with great
erosive power. These glaciers carved new scenery.
are three main types of glacial
erosion - plucking, abrasion and freeze thaw.
is when melt water from a glacier freezes around lumps of
cracked and broken rock. When the ice moves downhill, rock
is plucked from the back wall. Abrasion is when rock frozen
to the base and the back of the glacier scrapes the bed
rock. Freeze-thaw is when melt water or rain gets into cracks
in the bed rock, usually the back wall. At night the water
freezes, expands and causes the crack to get larger. Eventually
the rock will break away.