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Vocabulary
Structure of the Earth
Continental Drift Theory
Plate Tectonics
Miscellaneous
100

Wegener hypothesized that, long ago, most or all of the continents were assembled as a ______________________, which he called Pangaea.

What is a supercontinent?

100
There are ______________ main layers of the Earth.
What is four
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

Earth's surface is broken up into more than a dozen distinct plates, called ______________ ____________, that slowly move in different directions.

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 liquide
What is dense
300

Evidence suggested that, at one time, the continents had been fused together but had slowly drifted apart over time.

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

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
400

In undisturbed sedimentary rock layers, according to this law, the oldest layer is at the bottom and the youngest layer is at the top.

What is superposition.

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

What is convection cycles in the mantle

400

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

What is a transform boundary

500

Bones and other traces of very ancient animals and plants.

What is a fossil.

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!