Continental Drift
Seafloor Spreading
Plate Boundaries
More Plate Boundaries
Vocabulary
100
The theory of continental drift was proposed by this man.
What is Alfred Wegner
100
He proposed the theory of sea floor spreading.
What is Henry Hess
100
The area where oceanic plates are pushed down under continental plate.
What is a subduction zone.
100
These are the areas where two plates are moving together.
What is a convergent boundary.
100
The theory that describes Earth's crust and upper mantle as being broken into sections.
What is plate tectonics.
200

This is the name of the Super Continent that once existed before all the continents drifted to their current locations.

What is Pangaea?

200
This is the location of the youngest rocks in the ocean.
What are the mid-ocean ridges.
200
This type of boundary is formed where two plates are moving away from each other.
What is a divergent boundary.
200
The San Andreas fault in California has formed along this type of boundary.
What is a transform boundary.
200
The rigid layer of Earth about 100 km thick, made of the crust and a part of the upper mantle.
What is the lithosphere
300
These are the two types of materials that were found on multiple continents that help provide evidence of the theory of continental drift.
What are fossils and rocks.
300
This evidence that supports the theory of seafloor spreading can be found in rocks at the bottom of the ocean floor.
What is magnetic reversals.
300
These form when two continental plates collide with each other.
What are mountains.
300
As the Indo-Australian and Eurasian plates are colliding with each other, this mountain range is forming
What are the Himalayas.
300

A large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the asthenosphere.

What is a tectonic plate?

400
The name of the large aquatic reptile fossil that was found on both South America and Africa, supporting the theory that the continents were once much closer to each other.
What is Mesosaurus.
400
The concept of seafloor spreading helped validate this earlier scientific theory.
What is continental drift.
400
These occur when plates slide past one another.
What are earthquakes.
400
These tend to form when an oceanic and continental plate collide.
What are volcanoes.
400

Wegener's hypothesis that all continents were once connected in a single, large landmass that broke apart about 200 million years ago and slowly moved to their current positions.

What is continental drift.

500
The plant fossil that was found on multiple continents which also supports the theory of continental drift.
What is Glossopteris
500
This material seeps out of the cracks at the mid-ocean ridge to form new oceanic crust.
What is magma
500
This is the cycle of heating, rising, cooling and sinking of the material beneath Earth's crust that is thought to be responsible for the movement of plates.
What is a convection current.
500
The mid-ocean ridges are good examples of this type of plate boundary.
What is a divergent boundary.
500
Current in Earth's mantle that transfers heat in Earth's interior and is the driving force for plate tectonics.
What is convection current.
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