WHAT ARE GLACIERS?
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WHAT ARE GLACIERS?
Description of glaciers, their movement and speed. Glaciers at the Polar Caps. Glacial erosion. A famous pyramidal peak: Mount Cervino. Fjords. Glaciers also transport moraines. Glacial circuses and valleys. Summary.
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INTRODUCTION
-Water in several solid states influences the way in which peaks, valleys, fiords and lakes of cold zones and mountainous regions are formed.
-At these zones, the yearly mean temperature does not exceed 0º C
GLACIERS
-What are glaciers?
-Nowadays, glaciers occupy something like 10% of the area of all continents.
-Glaciers move quicker at its centre than at their edges.
-The final speed of the glaciers depends on the angle of the slope down which they’re sliding, their own thickness, width, base rugosity and the environmental temperature.
-Parts of a glaciar: the glacial circus, the glacial valley, the glacier’s tongue
-The icebergs
-Alpine-glaciers : The Himalaya, the Andes, the Alps, the Rocky Mountains
-Polar-region glaciers
-The Polar Ice-caps: The Northern one in Greenland and the Southern one in the Antarctic
-Icebergs and marine disasters. The sinking of The Titanic
GLACIAL EROSION
-Ice in movement tends to modify vast areas of the landscape due to the effect of erosion along the valley floor. Cliffs surrounding the glacial circus are receding continuously due to the effect of erosion produced by the ice and the snow.
-The Glacial edges
-Pyramidal peak or horn. The Cervino Mount.
-When glaciers disappear. Lakes.
-Valleys formed by glacial tongues which finished up in the sea during the last Ice Age were flooded when the sea-level rose due to the melting ice.
-The fiords. The moraines.
SUMMARY |
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