GEOL107 Chapter 1.3: Chapter 1.3
28 Oct 2018
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Chapter 1 introducing geology, the essentials of plate tectonics, and other important. 1. 3 an overview of physical geology - important concepts. Earth"s internal heat engine is driven by heat moving from the hot interior of earth toward the cooler exterior. Earth"s external heat engine is driven by solar energy. Sun provides the energy for circulating the atmosphere and oceans. Over time, moisture at earth"s surface helps rock disintegrate. Earth"s internal heat engine works because hot, buoyant material deep within the. Earth moves slowly upward toward the cool surface and cold, denser material moves downward. Based upon changes in chemical composition and density. Oceanic crust - relatively thin; underlies the oceans. Continental crust - much thicker; made up of many different types of rock. Mantle - thickest and most voluminous zone (more than 80% of earth"s volume); solid rock. Core - innermost layer; densest layer; believed to be made of metal. Based upon changes in mechanical behavior or strength.
