Wegener
Under the Sea
Plate Tectonics
Boundaries
Key Concepts
100
The name Wegener game to the super-continent that existed 300 million years age
What is Pangea?
100

The adding of new material to the ocean floor as plates move apart

What is Sea-Floor Spreading?

100
This constant motion causes the plates to move
What are Convection Currents?
100
When to plates collide
What is Convergent Boundaries?
100

The Earth's outer layer is made of ......

What is hard, solid rock?

200
Term for an ancient organism that has been preserved in rock
What is a Fossil?
200
Long underwater mountain chains formed by divergent boundaries
What are Mid-Ocean Ridges?
200

Mountain chain caused by India crashing into Asia

What are the Himalayas?

200
When two plates separate
What is Divergent Boundaries?
200

Earth's outer layer is divided into sections called _____.

What are plates or tectonic plates?

300
Wegener's hypothesis was rejected because he could not prove this
What is How the Plate Move?
300

During subduction, the ocean floor sinks back into the mantle creating these underwater

What are subduction zones or trenches?

300

Geologic feature that forms on the upper plate of a subduction zone

What is a volcano?

300
When two plates slide past each other
What is Transform Boundaries?
300

The process that moves all tectonic plates. 

What is convection?

400

Type of evidence that Wegener did not have for plate motion

What is direct evidence?

400

The 3 types of evidence for sea-floor spreading are ocean material, rock drilling, and this

What is GPS?

400
Transform boundaries usually cause these
What are Earthquakes?
400

A divergent plate boundary on land. 

What is a Rift Valley?

400

What happens to the Earth's outer layer over time.

What is move?

500

Fossil found on both Africa and South America that couldn't swim

What is Mesosaurus?

500
In the mid-1900s, scientists mapped the ocean floor using this
What is Sonar?
500
Plate boundary closest to us

What is 12?

500
In the mid-1960s, geologists combined all they knew about plates into a single _____________
What is Theory?
500

Earth's plates move on top of a ________, solid layer of rock called the _____________.

What is soft and mantle?

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