Geography 2122A/B Study Guide - Midterm Guide: Hydrosphere, Convergent Boundary, Geosphere
10 Feb 2015
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Earth sciences 1022b lecture brief 8 jan 15. Geology (study of earth) is important for energy and natural resources, solving environmental problems, building cities and highways, predicting and protecting against natural disasters like earthquakes, volcanic eruptions, landslides, floods. Uniformitarianism: fundamental principle the present is the key to the past . How long? geologic time is measured in billions of years. Within the disc, earth evolved through many collisions of rocky and metallic fragments into a rocky sphere divided into a dense core, large mantle, and lighter crust.
