EVR 1001 Lecture Notes - Lecture 5: Cation-Exchange Capacity, Porosity, Placer Mining
24 Sep 2016
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Core: innermost zone of the planet, largely nickel and iron. Mantle: above the core, contains magma (molten rock). Asthenosphere: the outer part of the mantle; semi-molten rock. Lithosphere: the brittle outermost layer of the planet, approximately 100 km thick. The earth"s geologic cycle consists of three cycles: the tectonic cycle, the rock cycle, and soil formation. Convection: heat from earth"s core causes plumes of hot magma to well upward fom the mantle. Hotspots: intra-place locations where molten material from the mantle reach the lithosphere. Tophat. com: the earth is about billion years old 4. 6. Plate tectonics: the earth"s lithosphere is divided into plates, which are in constant motion. Earth"s history is measured by the geologic time scale. Divergent plate boundaries: plates move apart from on another. Convergent plate boundaries: plates move toward one another and collide, with great force. Transform fault boundaries: plates move sideways past each other.
