4354 - I - Page 3 12). The map below shows a portion of the continent of Antarctica. The size and shape of the West Antarctic Ice Sheet depends on
many factors, including melting and freezing beneath the glacier, the amount of snowfall, snow removal by wind, iceberg
formation, and the rate of ice flow. Glacial
moraines are found in the Executive Committee Mountains shown on the map.
Moraines are located up to 100 meters in elevation above the present ice sheet surface, which indicates that a thicker ice sheet
existed 20,000 years ago
The world's oceans and climate are influenced by Antarctica's ice. Even a small increase in sea level from melting glaciers would
be a disaster for the nearly two billion people who live near coastal areas.
Ice Divide
| -90°W
East
Antarctica
Pine Island
SOUTH POLE
Whitmore
Mountains
West
Antarctica
Byrd
Station
Glacier
Transantarctic Mountains
Thwaites
Glacier
AMUNDSEN
SEA
Executive Committee
Mountains
-120W
Ross Ice
Shelf
-80S
Roosevelt
Island McMurdo
Station
-M. SELT
ROSS
SEA
Based on the given information, identify one piece of evidence found on the sides of some Antarctic mountains that indicates
that an ice sheet, hundreds of meters thicker than the current ice sheet, existed in the past.