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

This is the mechanism (what causes) the plates to move

What are CONVECTION CURRENTS in the mantle?

100
Created the Continental Drift Theory
Who is Alfred Wegener
100

Where two plates meet; earthquakes & various landforms happen here

What is a PLATE BOUNDARY?

100

The Himalayan mountains are the result of a ___________________________ boundary.

What is convergent collision 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
Evidence of matching animal fossils from two separate continents _____________________ and _____________________
What is Africa and South America
200

The mid-ocean ridge is a landform at a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.

What is divergent boundary; sea-floor spreading

200

Oceanic crust sinks below continental crust because oceanic crust is...

What is MORE 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
Evidence of tropical plants were found on this continent
What is Antarctica
300

This landform occurs when two continental plates collide together.

What is FOLDED MOUNTAINS?

300

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

What is EARTHQUAKES?

400

States that youngest rocks of ocean floor are at divergent 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

Supercontinent that existed around 250 million years ago

What is PANGAEA?

400

Volcanoes & ____________ form at convergent subduction boundaries.

What are TRENCHES?

400
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform boundary
500

When one plate is pushed under another because of differences in density.

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
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
500
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!
M
e
n
u