Continental Drift
Seafloor Spreading
Plate Tectonics
Extra Terms
Bonus Questions
100
First scientist to talk about continents moving.
Who is Alfred Wegener?
100
Henry Hess
Who proposed the idea of seafloor spreading?
100
The Lithosphere.
What are tectonic plates made of?
100
When two plates collide and the denser one slips beneath the other.
What is a subduction zone?
100
There are lots of landforms underwater such as mountains and valleys.
What did sonar reveal?
200
All continents were once connected, and moved slowly to their current position.
What did Alfred Wegener hypothesize about the continents?
200
The theory that more than just the continents were moving.
What is Seafloor Spreading?
200
The Earth's crust and part of the upper mantle.
What is the Lithosphere?
200
Plate boundaries.
What is it called where two plates meet and interact with each other?
200
Volcanoes can form there.
What is a common result of subduction?
300
He called it Pangaea.
What was the name of the single landmass all continents were once part of?
300
Sonar, or by using sound waves.
How did people map the ocean floor?
300
A large plastic-like layer that the plates move around on.
What is the Asthenosphere?
300
A place where a plate begins to pull apart.
What is a Rift Valley?
300
Asia and India crashed together forming the mountain range.
How were the Himalayas formed?
400
Laurasia and Gondwana
What are the names of the two landmasses Pangaea split into?
400
Mid-Oceanic Ridges.
How did the seafloor spread apart?
400
When two plates move away from each other.
What is a divergent boundary?
400
A place where two plates slide against each other while moving in different directions, or in the same direction at different speeds.
What is a transform fault?
400
San Andreas
What is one of the more popular transform/strike-slip faults?
500
Wegener had no proof as to why or how this happened.
Why was Wegener's hypothesis rejected?
500
Magma rises to the top.
What rises to the surface at the mid-oceanic ridges?
500
When two plates move together.
What is a convergent boundary?
500
Strike-slip fault.
What is an alternate name to a transform fault?
500
Movement at one boundary changes things at opposite boundaries as well.
If movement happens at one plate what must happen at the other?
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