Download presentation
Presentation is loading. Please wait.
1
Introduction to Earth Structure
A Big Picture Overview
2
To sustain such topography the earth must be dynamic
3
Earth’s primary Layered structure
4
What is the “shallow” structure?
Shallow = ~ 200 km Note the names of the layers and thicknesses. Not labelled: Inner core begins at ~ 5,150 km depth
5
CRUST and UPPER MANTLE
6
Note: does not show full lithospheric depth!
7
Bathymetry (topography of the ocean floor)
8
8000 m - 10,400 m Reference (“0”) Features of the topography?
9
“Hypsometric Curve”
10
Typical Numbers for “crustal thickness”
Continental: Average ~ 35 km Continental: Range: 20 – 75 km Oceanic: Average ~ 7 km Oceanic: Range ~ 5 – 10 km Lithosphere: (fill in yourself!) Asthenosphere: (fill in yourself!)
11
Cross section of the earth
12
EARTH’S DENSITY AS A FUNCTION OF DEPTH
APPROXIMATE COMPOSITION OF MAJOR LAYERS
13
DENSITY vs DEPTH
14
Composition in the major layers of the Earth
15
What is the earth made of?
16
What is the temperature inside the earth?
“geothermal gradient”
17
All this suggests the earth has a roughly “layered structure”
What is the layered structure? How was it discovered? All this suggests the earth has a roughly “layered structure”
20
Cross section of the earth
32
Earth’s magnetic field is not the result of a “bar magnet” in the interior.
33
Earth’s Magnetic Field Reversal (Simulation)
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.