Where can continental glaciers be seen?
Today, continental glaciers cover most of Antarctica and the island of Greenland. Massive ice sheets covered much of North America and Europe during the Pleistocene time period.
Is Greenland a continental glacier?
Continental glaciers are continuous masses of ice that are much larger than alpine glaciers. Small continental glaciers are called ice fields. Big continental glaciers are called ice sheets. Greenland and Antarctica are almost entirely covered with ice sheets that are up to 3500 m (11 500 ft) thick.
What direction do continental glaciers move?
Moving forward Under the pressure of its own weight and the forces of gravity, a glacier will begin to move, or flow, outwards and downwards. Valley glaciers flow down valleys, and continental ice sheets flow outward in all directions.
What is the difference between a continental glacier and a valley glacier?
Glacial ice flows away from the zone of accumulation when the thick ice deforms plastically under its own weight. In a valley glacier the ice flows downslope from the zone of accumulation, while for a continental glacier the ice flows laterally outward and away from the zone of accumulation.
What causes a glacier to start moving?
Gravity is the cause of glacier motion; the ice slowly flows and deforms (changes) in response to gravity. A glacier molds itself to the land and also molds the land as it creeps down the valley. Many glaciers slide on their beds, which enables them to move faster.
What two factors cause glaciers to move?
Glaciers move by a combination of (1) deformation of the ice itself and (2) motion at the glacier base. At the bottom of the glacier, ice can slide over bedrock or shear subglacial sediments.
What is it called when a glacier moves?
A glacier might look like a solid block of ice, but it is actually moving very slowly. The glacier moves because pressure from the weight of the overlying ice causes it to deform and flow. Occasionally a glacier speeds up. This is called surging. A surging glacier can advance tens or even hundreds of metres a day.
Which is colder Antarctica or Greenland?
Antarctica, the large land mass in the Southern Hemisphere, is the coldest place on Earth. Bottom line: Antarctica, Greenland and Siberia are among the coldest places on Earth. The lowest surface air temperature ever observed on Earth was recorded at the Vostok research station in Antarctica on July 21, 1983.