By ice, Cumbria
This ridge along the edge of a field is evidence that this area was covered by ice about 10,000 years ago. It was not constructed, but was left at the front of a melting glacier, as with melting glaciers in Canada or Norway today.
As glaciers move they scrape along the valley floor eroding large amounts of rock. material. They also transport frost-shattered boulders that fall from the valley sides and land on the glacier. When the glacier melts, this mixture of finely-ground rock, pebbles and large boulders, called moraine - is left as ridges both at the glacier “snout” (terminal moraine) and along the valley sides (lateral moraine).
As glaciers move they scrape along the valley floor eroding large amounts of rock. material. They also transport frost-shattered boulders that fall from the valley sides and land on the glacier. When the glacier melts, this mixture of finely-ground rock, pebbles and large boulders, called moraine - is left as ridges both at the glacier “snout” (terminal moraine) and along the valley sides (lateral moraine).
Glacial moraine at Borrowdale, Lake District
