Tugas teks Explanation

How Glaciers forms

        Glaciers are rivers of ice that forms at the mountain valleys and flowing down the valley to the mountains slowly due to the accumulation of ice, snow, rocks because of the temperature changes.

Glaciers began to occur in the basin-shaped mountain slopes is called the sirka (cirque). Glaciers are formed when fresh snow fall, after the precipitate trapped air between the flakes of snow being pushed out resulting solid snowflake is called the firn.

       When more and more snow fell on top of the mountains, firn be compacted into ice glaciers. Rocks (till) that falls from the top of the mountain will also be carried by the glacier. In areas of steep ice cracks split into wedge-shaped (crevasse).

       At the end of the glacier to melt and form a stream flowing down the mountain. Because the glacier contains of various substances such as rocks, snow and edimen, so that when the glacier slides down will change the contours of the mountains. During the winter the snow and glaciers grow. But during the summer some snow melt and evaporate. Year after year the snow in layers. Weight increase causes the snow crystals under the surface to be compacted and turned into pellets grainlike called firn. At a depth of 50 meters of firn is compressed even further into the dense glacial ice crystals. During the summer some snow and ice melt, but in some areas the glaciers does not rise high temperature. Glaciers can also increase and decrease the size because climate change across the glacier. For example, the Greenland ice sheet shrink because rising temperatures in the area.

      As the years pass the ice gets bigger and grows thicker and becomes too big to stand still. Ice began to move down the hill. When ice moves are called glacier.