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Geography Chapter 13 Notes

Geography Chapter 13 Notes - Chapter 13 Notes Introduction...

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Chapter 13 Notes: Introduction to Landform Study Four Regions of Earth’s Interior: - Crust: o Depth of 5 km below ocean to near 20 km below land o Less than 1% of the Earth’s volume o 0.4% of Earth’s mass o Moho discontinuity - Mantle: o Extends to depth of 2900 km (1800 miles) o Largest of four layers o 84% of total volume o 67% if total mass o Three sub layers: Lithosphere: the crust + the upper mantle Asthenosphere Rigid rocks – lower mantle - Outer Core: o Molten o Extends to depth of 5000 km - Inner Core: o Dense mass with radius of about 1450 km o Primarily made up of iron/nickel or iron/silicate o 15% of Earth’s volume o 32% of Earth’s mass o Magnetic field controlled by the outer core o Magnetic poles not the same as the axial poles Plate Tectonics and the Structure of Earth - Plate Tectonics o Continental-sized plates slide along the asthenosphere - Continental Drift The Composition of Earth - Minerals: o Naturally formed compounds and elements of Earth o Characteristics: Solid Natural
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