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Continental Drift
Seafloor Spreading
Plate Tectonics
Misc. 1
Misc. 2
100
Why did scienctists reject Wegener's hypothesis of continental drift.
Because he couldn't expain how or why the continents move.
100
The youngest rocks on the ocean floor are located?
At the mid-ocean ridges
100
Plates of the lithosphere float on the
Asthenosphere
100
Scientist believe that differences in ___________ cause hot, plasticlike rock in the asthenospere to rise toward Earth's surface.
density
100
Coal beds in Antarctica indicates that the continent once had
A tropical rainy climate
200
The crust and upper mantle is called
the lithosphere
200
The alignment of iron minerals in rock when they are formed reflects that the Earth has
reversed itself several times
200
The result of plate movement can be seen at______
plae boundaries
200
The East African Rift is an example of a ___________ boundary
continental rift or rift valley
200
The downward part of a convection current causes sinking force that
pulls continenets towards each other
300
The presence of the same ____________ on several continents supports the hypothesis of continental drift.
Fossils or rocks
300
Seafloor spreading occurs because
Molton material beneath Earth's crust rises to the surface
300
Plates move apart at ______________ boundaries
divergent
300
The Himalayan mountain range of India was formed at a
convergent boundary
300
What is the force on a plate when a slab sinks?
slab pull
400
The hypothesis that continents have slowly moved to their current locations is called
Continental drift.
400
While studying the ocean floor, scientists found aternating bands of
Magnetism
400
Plates slide past one another at __________
Transform boundaries
400
Active volcanoes are most likely to form at
Convergent oceanic-continental boundaries
400
What is the force that moves plates away from a mid-ocean ridge?
ridge push
500
What is the name Wegener gave to the supercontinent?
Pangaea
500
A _______________ is a sensitive device used to detect magnetic fields on the seafloor
magnetometer
500
The boundary between two plates moving together is called a
Convergent boundary
500
A line of volcanoes can also form when two oceanic plates______
collide
500
Name the force that causes the asthenosphere to drag the lithosphere?
basal drag