Reasons why the Earth have layers; Earth’s Internal Structure

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Reasons why the Earth have layers; Earth’s Internal Structure

Layers of the Earth

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Lecture Note
Northern Arizona University
Glg 112 - Geologic Disasters
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GLG 112 1st Edition Lecture 2 Outline of Last Lecture I. Course introduction Outline of Current Lecture I. Why does the Earth have layers? A. Early Earth was a very hot place B. Early Earth was completely molten C. The matter comprising Earth separated into layers based on density II. Earth’s Internal Structure (you should know the relative thickness of each layer) A. Compositional Layers (defined by composition/density) (know relative densities) 1. Core density ~ 10.7 g/cm3 2. Mantle density ~ 4.5 g/cm3 3. Crust (continental crust is thicker than oceanic crust) a. oceanic crust density ~ 2.9 g/cm3 b. continental crust density ~ 2.8 g/cm3 B. Rheological Layers (defined by Physical Properties) (know their physical properties) 1. Inner Core (solid) 2. Outer Core (liquid) 3. Lower Mantle (solid) 4. Asthenosphere (weak solid, soft solid) 5. Lithosphere (solid) Current Lecture These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.

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