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glaciers - Physical Geology 101 30 Ice and Glaciers(p...

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Physical Geology 101 1 30. Ice and Glaciers (p. 484-502) Glaciers What is the definition of a glacier ? ___________________________________________________ _______________________________________________________________________________ Types of Glaciers The ice in glaciers can be variable in temperature. At low and middle latitudes, the ice temperature may be close to melting point. What do we call these types of glaciers? _________________________ The high ice temperature results in an excess of ____________________ In the polar regions and at high altitudes, where mean annual temperatures are below freezing, the ice temperature is always low, with very little melting. What do we call these types of glaciers? _________________________ Both categories of glacier can vary in shape and size, so we classify glaciers into two main varieties based on their visible characteristics. These are: 1. _______________________ and 2. ________________________ Valley (or Alpine) glaciers resembles rivers in that larger glaciers may have smaller glaciers flowing into them called _______________________________. How big can valley glaciers get? Length: ____________ Width: ____________ Thickness: ____________ What type of glacier is produced when a valley glacier exits a valley and spreads out over a wide plain? ____________________________ What is another name for continental glaciers? ________________ (must be at least 50,000 km 2 in size). If they are smaller than this, we call them _________________. Where are ice caps typically found? ___________________________________ How thick can ice sheets get? __________________ Where are the only two places on Earth where we see ice sheets today? _______________________ and _______________________ In what direction do ice sheets flow? _____________________________________
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Physical Geology 101 2 What is the main control on the motion of ice sheets? __________________________ Evolution of Glaciers Glacier size changes in response to changes in temperature and precipitation. The amount of snow that gets added to a glacier is called ____________________. Most of this snow falls at the ____________ of the glacier (the highest part), which is also therefore referred to as the _____________________________. Any loss in ice and snow is an overall process called ___________________. This may occur by melting in the summer or when ice turns into vapor by ___________________.
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