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Unformatted text preview: then so on. ← Earth has 3 compositional layers • Crust, Mantle, Core ← Lithosphere • Rigid layer composed of crust and uppermost mantle • Divided into mobile tectonic plates ← Asthenosphere • Weaker layer found in upper part of mantle ← Older oceanic lithosphere destroyed at subduction zone ← The energy source is heat in the Earth ← The force involves is Gravity ← Divergent: plates move apart (i.e. Oceanic Ridges) ← Convergent: Plates move toward each other (i.e. Subduction zone) ← Transform: plates move up and down of each other (i.e. San Andrea’s fault) 30/01/2008 16:58:00 ← 30/01/2008 16:58:00 ←...
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- Spring '08
- Plate Tectonics, geographic north pole, North Pole Ridge