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Lecture 2

GEOG 1120 Lecture Notes - Lecture 2: Mafic, Slab Pull, PlatPremium

3 pages105 viewsFall 2016

Department
Geography
Course Code
GEOG 1120
Professor
John Martin
Lecture
2

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Lecture 2: Plate Tectonics
I. Structure of Earth:
1. Chemical
- Elements: Oxygen, Silicon, Aluminum, Iron.
- Crust => Two types:
1. Oceanic Crust (OC)
=> Elements: Fe, Mg => "Mafic".
=> Heavier; Higher Density.
2. Continental Crust (CC)
=> Elements: Si, O.
=> Lighter elements; Lower Density.
- Mantle => Elements: 0, Mg, Si, Fe; located between the Core
and the Crust.
- Core => Elements: Fe, Ni.
2. Physical
- Crust = Lithosphere (crust and upper mantle).
=> Solid layer.
- Asthenosphere = (2nd layer) upper mantle; Plastic (halfway
between solid and liquid layer).
- Mesosphere = mantle, solid layer.
- Core = has two layers
=> Inner Core and Outer Core.
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