Plate Tectonics

1
Plate Tectonics
2
Earths Internal Structure

• Crust
• Core
• Mantle

3
(No Transcript)
4
In which layer is most of the mass of the Earth
located?
5
Two Types of Crust
6
What is one difference between oceanic crust and
continental crust?
A second difference is that the continental crust
is composed of granite while the oceanic crust is
composed of basalt.
Finally, the density of the continental crust is
less than the oceanic crust, thus it floats
higher on the mantle.
7
(No Transcript)
8
The mantle increases in temperature depending on
how close it is to the core. The rocks in the
upper mantle are brittle and break while the
rocks in the lower mantle are soft and flow
instead of break.
9
The core is thought to be composed of nickel and
iron alloy. The outer core is liquid while the
inner core is solid. Tremendous pressure,
produced by the weight of the overlying rocks is
believed to crowd the atoms tightly together and
prevent the liquid state.
10
Convergent Boundary Continental/Oceanic
11
Convergent Boundary Oceanic/Oceanic
12
Convergent Boundary Continental/Continental
13
Divergent Boundary Oceanic
14
Divergent Boundary Continental
15
Special Thanks to Hobart M. King hobart_at_geology.c
om http//geology.com for the animations and
blackline drawings