San Francisco is surrounded on three sides by water which causes the weather to be strongly influenced by the cool currents of the Pacific Ocean. Because of its sharp topography and maritime influences, San Francisco exhibits a multitude of distinct microclimates.Many types of rocks and soils are found in San Francisco, like sedentary rocks of sandstone, limstone, and shale in uplifted seabeds, coal deposits, and igneous forms such as basalt flows, and ash deposits of extinct volcanoes. San Francisco is known for its hills because there are over 50 hills within the city limits. The tallest hill in San Francisco is Mount Davidson which is 925 feet high.
Source:
http://en.wikipedia.org/wiki/San_Francisco
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