Show:
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
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
Breaks in the Earth's crust
What are Faults?
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 Deep Ocean Trenches?
300
Two continental plates colliding will create this
What are Mountains?
300
When two plates slide past each other
What is Transform Boundaries?
300

The process that moves all tectonic plates. 

What is convection?

400
Term for the continents slow movement on Earth's surface
What is Continental Drift?
400
The 3 types of evidence for sea-floor spreading are ocean material, rock drilling, and this
What is Magnetic Stripes?
400
Transform boundaries usually cause these
What are Earthquakes?
400
Two continental plates separating will create this
What is a Rift Valley?
400

The plates of Earth's outer layer _________.

What is move?

500
The remains of a tropical plant in a cold area was proof of this type of evidence
What is Climate?
500
In the mid-1900s, scientists mapped the ocean floor using this
What is Sonar?
500
Plates move about 1 cm to about ________ cm a year
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?