When do we call a chunk of ice a glacier? Usually, the ice mass has to be at least 100m x 100m in size and needs to show some signs of a present or past movement.
Generally, glaciers are divided into two main groups – Ice Sheets and Valley Glaciers, each with several sub-types.
Ice Sheets or Continental Glaciers are the largest masses of ice on Earth spreading over 50,000 square kilometres with the depth of ice sometimes more than 4,200m. They are only found in Antarctica and Greenland. Ice Shelves are floating extensions (more…)
The ice flow of a glacier is divided into two types, internal deformation and basal sliding. Internal deformation is movement of parts of the glacier relative to itself. Throughout the descent of the glacier, the ice at the sides and bottom side of the glacier are subject to more friction from the valley floor and walls, and therefore forced to move at a slower rate than the ice in the centre of the glacier. As a result (more…)
The unique environment of Westland National Park is responsible for the formation of the local glaciers. These powerful remnants of an ice age manage to survive warming temperatures due to the very special weather conditions on the West Coast of the South Island. Up to 16 metres of precipitation falls on the tops of the Southern Alps every year, most of it falling as snow. This massive amount of snow (more…)