Vocabulary
Structure of the Earth
Continental Drift Theory
Plate Tectonics
Miscellaneous
1
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory
1

The specific layer where convection occurs is the _______________________.

What is the asthenosphere

1

____ and ____ have been found on different continents, providing evidence of continental drift.

Fossils and rock

1
Where the crust is destroyed at a plate boundary.  

What is a subduction zone

1
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes
1
A number of rigid, but moving, pieces of Earth's surface
What is tectonic plates.
1
The thickest layer of the Earth
What is the mantle.
1

The evidence of continental drift that puts South America and Africa together because of the coastlines

What is the shape of the continents

1
The mid-ocean ridge is an example of a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.
What is divergent boundary; sea-floor spreading
1
Hot air or liquid is less ________________ than cool air or liquide
What is dense
1
The thinnest layer of the Earth
What is the crust
1

The Earth gets ___ as you move into the center.

What is hotter

1
Created the Continental Drift Theory
Who is Alfred Wegener
1
Earthquakes and Volcanoes are usually located in relation to these
What is a plate boundary
1
The Himalayan mountains are the result of a ___________________________ boundary.
What is convergent boundary
1

States that youngest rocks of ocean floor are closest to divergent boundaries, moving outward

What is seafloor spreading

1

The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)

What is the lithosphere

1
Pangaea existed this many millions of years ago
What is around 250 million years ago
1
This is the mechanism (what causes) the plates to move
What is convection cycles in the mantle
1
The San Andreas Fault in California is an example of a ____________________ boundary.
What is a transform boundary
1

The theory that states that the lithosphere is broken into plates that in moving due to convection currents underneath them 

What is the plate tectonics

1
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents.
1
Continental Drift Theory was not accepted because it did not explain this
What is how the continents moved
1

The two types of convergent boundaries

What is subduction (0-C where volcanoes often occur) and collision (C-C where mountains are usually formed)

1
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!
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