The Theory of Plate Tectonics
Earth's Interior
Convection and the Mantle
Drifting Continents
Sea-Floor Spreading
100

According to Wilson, the lithosphere is broken into separate sections. What do we call these sections?

Plates

100
What are the layers of earth's interior?
the crust, mantle, outer core, and inner core
100

What is the measure of how much mass there is in the volume of a substance?

density

100
What is the hypothesis that all the continents were once joined together in a single landmass and have since drifted apart?
continental drift
100
What is the name of the stream of mountains that curve along the sea-floor, extending into all of earth's oceans?
mid-ocean ridge
200

What is a scientific theory?

A well-tested concept that explains a wide range of observations.

200

What do we call the uppermost part of the mantle?

the lithosphere

200

When temperature increases, does the density of liquid increase or decrease?

decrease.

200

What type of plate boundary causes India to create the Himalayan Mountains?

Convergent plate boundary

200
A radical idea proposed by Hess that new material is added to the ocean floor.
What is sea-floor spreading.
300
What is the theory that states that pieces of earth's lithosphere are in slow, constant motion, driven by convection currents in the mantle?
plate tectonics
300
What are the waves that geologists use to study earth's interior?
seismic waves
300

When convection currents cause two pieces of oceanic crust to move towards each other, what type of boundary is it called?

Convergent boundary

300
What is the name of the scientist that thought of continental drift?
Who is Alfred Wegener.
300

What causes seafloor spreading?

Convection currents in the mantle.

400

What does the theory of plate tectonics explain?

How the plates moves.

400

List the layers in order from the center to the outside.

Core, Outer Core, Mantle, Crust

400

What is the difference between convergent and divergent boundaries?

convergent boundaries move towards each other. Divergent boundaries move away from each other.

400
According to Wegener, what is the name of the supercontinent formed from continents drifted together?
Pangea
400

Is sea-floor spreading a fact?

no, it is a theory.

500

What are the three kinds of plate boundaries?

Convergent, Divergent, Transform

500

How does the density of Earth's layers change as you get closer to the core?

The density increases.

500

When convection currents cause oceanic and continental crust to move towards each other, what type of landform is created?

volcanic mountains

500
Why was Wegener's hypothesis rejected?
Wegener could not provide a satisfactory explanation for the force that pushes or pulls the continents.
500

What is created when continental crust separates at divergent plate boundaries?

Rift valleys are created, eventually leading to the creation of mid-ocean ridges.

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