Continental Drift
Seafloor Spreading
Boundaries
Convection
Everything
100
Why did scientists first reject the theory of continental drift?
What is there was not enough evidence.
100
Magma rises to the surface because it is ________ than the surrounding rock.
What is less dense.
100
Two plates moving apart is called a(n) _____.
What is divergent boundary.
100
The transfer of thermal energy by the movement of heated matter is called what?
What is convection.
100
What are the three types of convergent boundaries?
What is c-c, o-o, o-c.
200
Who was the scientists that proposed continental drift?
Who is Alfred Wegener.
200
Who was the scientist who seafloor spreading?
Who is Harry Hess.
200
Two plats sliding past each other is called a(n) _______.
What is transform boundary.
200
The driving force that move the plates in different directions?
What is convection currents.
200
___________ is a fossil fern that helped support Wegener's hypothesis of continental drift.
What is the Glossopteris.
300
The first piece of evidence Wegener had was the continentals had a _______________.
What is puzzle-like fit.
300
The youngest part of the seafloor is _______ to the ridge.
What is closest.
300
Two plates coming together is called a(n) _____.
What is convergent boundary.
300
Magma is forced toward crust and hardens making new ______ at ridges.
What is seafloor.
300
Earth's continents were once joined as a single landmass called _____.
What is Pangaea.
400
Similar fossils were found on ___________ to support Wegener's idea.
What is different continents.
400
___________ reversals occur in the iron-bearing material when the Earth's magnetic field flips.
What is magnetic.
400
What is the layer that the lithosphere "floats" and moves on?
What is the asthenosphere.
400
Convection currents gave continental drift a mechanism for movement which lead to the theory of __________.
What is plate tectonics.
400
Mountains happen because of what two types of plates?
What is continental-continental.
500
________ was found in South America, indicating different climates on continents in the past.
What is glacial scouring. (Accept: glaciers)
500
The theory of ____________ explains how new ocean crust is created at ocean ridges and destroyed in deep-sea trenches.
What is seafloor spreading.
500
The layer that is broken into sections called plates is called what?
What is the lithosphere.
500
Convection currents transfer thermal energy from ______ regions to ________ regions.
What is warmer regions to cooler regions.
500
When two oceanic plates diverge, what is created?
What is a ridge.
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