Crevasses (Deep Fractures or Cracks)form Because ________

question 28

Multiple Choice

Crevasses (deep fractures or cracks) form because ________.

• A)not all of the ice in a glacier moves downhill at the same rate in the glacier
• B)as the glacier moves over irregular topography the bottom of the glacier (known as the zone of fracture)cracks and the cracks propagate upward to the surface of the glacier
• C)as the glacier moves over irregular topography,the brittle upper layer or zone of fracture is subject to tension and cracks above the ductile layer
• D)as the glacier moves over irregular topography,cracks can form anywhere in the glacier but they are called "crevasses" only if they are near the surface
• E)there is not always the same amount of ice available in all areas so cracks form when the ice tries to move and fill in empty parts of the glacier

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Definitions:

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