Plate Tectonics: Continental Drift & Seafloor Spreading

Plate Tectonics: Continental Drift & Seafloor Spreading

Assessment

Flashcard

Science

6th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

Front

What is sea-floor spreading?

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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