Earth Science World Image Bank

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Photo ID: h0wn0f	Subject: Glaciers	Description
	Bedding Plane Irregularities; Erosion; Glacial Features; Glacier National Park; Grooves; Sperry Glacier; Striations	Glacial striations on bedrock. Rocks embedded in the bottom of the glacier served as "tools" that scratched the bedrock over which the glacier moved. These features are useful indicators both of the former presence of glaciers and of the direction in which the glacier moved.
	Photographer	Location
	USGS Credit Line: Courtesy United States Geological Survey	North America; United States; Montana; Glacier National Park
Photo Quality \| Large