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A glacier is a huge block of ice that flows very slowly over land. Glaciers are formed in the North Pole and South Pole and in high mountains. The cold climate and low temperatures in these areas help large amounts of ice to collect and turn into ice blocks.

Glaciers begin to form when more snow falls during the winter months than it evaporates in the summer months. The snow builds up in layers and these layers get heavy because of their weight. Gradually, the ice becomes so thick that it begins to move because of its own weight and starts to move down the mountains. This happens due to the Law of Gravity As they move down the slopes of mountains they melt very slowly getting heat from the Earth.

As glaciers move downwards, they also change the shape of the land they move on. Most glaciers flow extremely slowly and move less than 30 centimetres a day But some glaciers can also flow up to 15 centimetres a day. The various parts of a glacier move at different speed. The central and upper part of a glacier flows the fastest. The sides and bottom move more slowly because they rub against the walls and floor of the valley.

World's most famous glaciers are in Europe. They lie in the French and Swiss Alps. They are Mer de Glace and the Aletsch Glacier. There are glaciers in North America as well, such as the Malaspina Glacier in Alaska.

What is a glacier?

A)  It is a huge block of ice that flows slowly over-land.

B)  It is a small ice cube formed in refrigerator.

C)  It is a small ice cube floating in oceans.

D)  It is a huge block of ice on mountains.

E)  None of these