Glacial moraine holding lake at the base of the Granadier Range. Large blocks of glacially derived material were dumped at the down-valley side of the glacier when it was active. The moraine dammed melt waters from the receding glacier to form a lake.
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.
Image showing snow covered Half Dome and valley in Yosemite National Park, eastern California. Yosemite became a National Park in 1890, and contains the world's three largest monoliths of exposed granite. The granitic rocks that form Half Dome and other spectacular Park features represent unerupted magma later exposed by deep erosion and glaciation.