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Vocabulary
Structure of the Earth
Plate Tectonics
plate boundary
Misc.
100
A number of rigid, but moving, pieces of Earth's surface
What is tectonic plates.
100
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents.
100
Earthquakes and Volcanoes are usually located in relation to these
What is a plate boundary
100
The Himalayan mountains are the result of a ___________________________ boundary.
What is convergent boundary
100
Created the Continental Drift Theory
Who is Alfred Wegener
200

a place where there is a long break in the rock that forms the surface of the earth and where earthquakes are more likely to happen

what is a fault 

200
The thickest layer of the Earth
What is the mantle.
200
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
200
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform boundary
200
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved
300
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory
300
Plates float on top of the _______________________.
What is the asthenosphere
300
Name four of the major plates
What is any of the following North American plate, South American plate, Eurasian Plate, Indoaustralia plate, African plate, Antarctica plate
300
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes
300
This person used sonar to map the bottom of the ocean and discovered the mid-ocean ridge in the Atlantic Ocean.
Who is Harry Hess!
400
States that youngest rocks of ocean floor are at divergin boundaries, moving outward
What is seafloor spreading
400
This is the mechanism (what causes) the plates to move
What is convection cycles in the mantle