Precipitation – falling snow in the zone of accumulation , from avalanches or directly onto the glacier
During fresh snow falls air is trapped between the flakes.
Under pressure individual particles of ice melt around their edges allowing air to escape. One by one the particles slip forward on the thin film of water and immediately refreeze. In this way the ice of a glacier moves slowly forward in plastic flow at a speed of about 300m per year
Transfers - As more snow falls the underlying layers are compressed into ice. One by one the particles slip forward on the thin film of water and immediately refreeze. In this way the ice of a glacier moves slowly forward under the force of gravity.
Outputs – outputs from the system. Ablation is the melting of a glacier which produces meltwater
Write a sentence to explain why the glacier is described as a system – what are the inputs, stores, transfers, outputs.
What is meant by ablation and accumulation
When and where is accumulation highest?
When and where is ablation highest?
South Cascade Glacier USA NT page 127 Describe the changes that has taken place in the South Cascade Glacier Why has the lower part of the glacier melted more over recent years Do the photos support the concept of global warming? Explain your answer. Source