What is sea-floor spreading?
Plate Tectonics: Continental Drift & Seafloor Spreading

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Science
•
6th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The process by which new oceanic crust is formed at mid-ocean ridges and gradually moves away from the ridge.
2.
FLASHCARD QUESTION
Front
Where does sea-floor spreading begin?
Back
At the mid-ocean ridge.
3.
FLASHCARD QUESTION
Front
What are the four geological time divisions in order from least to greatest?
Back
Epoch, Period, Era, Eon.
4.
FLASHCARD QUESTION
Front
What type of plate boundary occurs when two plates move apart?
Back
Divergent boundary.
5.
FLASHCARD QUESTION
Front
What happens at a convergent plate boundary?
Back
Two tectonic plates collide, which can lead to subduction or mountain formation.
6.
FLASHCARD QUESTION
Front
What is subduction?
Back
The process where one tectonic plate moves under another and sinks into the mantle.
7.
FLASHCARD QUESTION
Front
Why does oceanic crust sink below continental crust during subduction?
Back
Because oceanic crust is more dense than continental crust.
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