Vocabulary
Structure of the Earth
Continental Drift and Seafloor Spreading
Plate Tectonics
Miscellaneous
100
The thinnest layer of the Earth
What is the crust
100

State the three main(compositional) layers of the earth.

What are the crust, mantle, core.

100
Created the Continental Drift Theory
Who is Alfred Wegener
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

200

A number of rigid, but moving, pieces of Earth's surface

What are tectonic plates.

200
The thickest layer of the Earth
What is the mantle.
200

What continent fits like a puzzle piece next to South America?

What is Africa 

200

Land feature created when two continental plates collide.

What are mountains?

200

Hot air or liquid is less ________________ than cool air or liquid

What is dense

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

What is the process where new ocean crust is created at divergent plate boundaries because magma rises up and creates new rock?

What is seafloor spreading?

300

Plate are pieces of the _______________ broken into pieces. (give the mechanical name)

What is the lithosphere?

300

_________________ are a result from the build up of stress at a plate boundary.

What is earthquakes

400
States that youngest rocks of ocean floor are at divergin boundaries, moving outward
What is seafloor spreading
400
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
What is the lithosphere
400
Pangaea existed this many millions of years ago
What is around 250 million years ago
400

This is the mechanism (what causes) the plates to move (happens in the asthenosphere)

What are convection currents?

400

The San Andreas Fault in California is an example of a ____________________ boundary.

What is a transform boundary

500

The process by which one oceanic plate slides underneath another plate melting the plate and creating volcanoes.

What is subduction?

500
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents.
500
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved
500

What ocean floor feature is created at divergent plate boundaries because of sea-floor spreading?

What are mid-ocean ridges?

500

What was used to map the ocean floor in the 1950's and 1960's (in other words how did they know what was down there)?

What is sonar?

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