All that ice
A glacier is a large mass of ice that flows slowly over land in cold Polar Regions and high mountain valleys. Glaciers begin as snow on a mountaintop. As more snow falls, the weight of the new snow squeezes the snow already there. The snow on the bottom of the pile turns to ice. The ice becomes a glacier.
There are two kinds or glaciers. One is like a river of ice that slides down from the top of a mountain. The other is like frosting on a cake. It may cover entire mountain ranges and even whole continents.
When a glacier reaches the edge of the frozen land, a large crack will appear in it. With a loud noise like thunder, a huge piece of the glacier falls into the sea and floats away. This piece is called an iceberg.
The land called Antarctica, around the South Pole, is covered by a giant glacier. A sheet of ice that is more than 1.6 kilometres thick covers Antarctica. Under much of this ice is land with mountains, valleys, and plains.
Picture Credit : Google