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Plate Tectonics

A review of the 6th grade plate tectonics unit.

Mr. Honer

on 1 May 2015

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Transcript of Plate Tectonics

It all started with people looking at maps and making observations.
Alfred Wegener
looked at maps
and fossils
and developed the theory of
Continental Drift
the theory states that the continents were once joined together in a single landmass called
unfortunately, Wegener could not explain why the continents were moving.
Harry Hess
. . . discovered that the continents were moving away from each other at the mid ocean ridges.
This is called
Sea Floor
The combination of Wegener's Theory of Continental Drift and Hess's evidence of Sea Floor Spreading led to the development of the Theory of Plate Tectonics . . .
. . . the theory that the earth's surface is divided into giant plates that are in constant motion
The movement of the plates is caused by the circular motion of the hot rock in the mantle of the earth.
This movement is called
Convection Currents
Convection currents are responsible for . . .
and tsunamis
The Layers of the Earth are . . .
We know about the inside of the Earth because of observations of Seismic Waves and also from analysis of rocks from drilling.
By the way, did you know the difference between Magma and Lava?
Magma = molten rock and gasses in the Mantle
Lava =
molten rock on the surface
Now, let's see what's going on under the Earth's surface.
As you can see, the Earth is in a constant state of change. It is never the same from minute to minute!
the three plate boundaries are
divergent - the plates move away from each other
convergent - the plates move toward each other
transform - the plates slide next to each other
Full transcript