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

As new ocean crust is made, older crust is moving further from the mid ocean ridge.

What is sea floor spreading.

100

What evidence did Wegener discover about rock layers?

Mountain ranges with the same rock layers in North America and Europe
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 is 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 an example of a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.

What is divergent boundary; sea-floor spreading

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

Where do most volcanoes occur?

Convergent boundary between an oceanic plate and a continental plate.

300
_________________ are a result from the build up of stress at a plate boundary.
What is earthquakes
400

New Ocean Crust is made.

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

Why did no one believe Alfred Wegener's evidence?

How the continents moved.

400

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

What is convection cycles in the mantle

400

Where do most earthquakes occur?

transform boundary

500
Although the hottest layer of the Earth, this layer is solid metal
What is the inner core
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 type of land form is created when two continental plates converge?

Mountains

500

What causes convection currents?

Hot magma rises in the upper mantle (asthenosphere), then cools and falls back down. This cycle happens over and over again.