Glaciers scraped across the surface and altered landscapes and the course of rivers best describes the impact of glaciers upon the surface of the earth.
Glaciers are the huge big bodies which are formed by the compression of fallen snow on the land and converts into the ice.
Glaciers shows movement due to the gravitational force and this movement of glaciers will carry sediments, rocks and soil with it self. So, the glacier movement will affect the land by destroy the shape of land surface due to the transfer of land materials and sometimes block the path of rivers also.
Hence, option (b) is correct.
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