Plate Tectonics

Question 1

Use the drop-down menus to complete the sentences describing the important ideas in Hess’s theory. Hess expanded on Wegener’s theory of . Hess proposed the idea that are places where crust is created.

Revolt · Accepted Answer

continental drift; Selection 1: continental drift; Selection 2: mid-ocean ridges

Question 2

✔ mid-ocean ridgescontinents deep-ocean trenches

Revolt · Accepted Answer

mid-ocean ridges

Question 3

According to Hess’s theory, what might happen if the magma under a mid-ocean ridge cools?

Revolt · Accepted Answer

The plates on either side of the ridge might stop moving.

Question 4

What evidence supports Hess’s theory of seafloor spreading? Check all that apply.

Revolt · Accepted Answer

the direction iron in ocean rocks points; the age of different rocks on Earth’s surface; pillow-shaped rocks found in the sea

Question 5

A scientist is studying rock formations. She notices some unusual rocks like those pictured here. What can she conclude about this area?

Revolt · Accepted Answer

It was part of a slow underwater eruption.

Question 6

How does Earth’s magnetic field provide evidence for seafloor spreading?

Revolt · Accepted Answer

It creates a pattern of alternating rock stripes on both sides of a mid-ocean ridge.

Question 7

Look at the diagram and then answer the following questions. The process shown in this diagram is . Letter A in the diagram indicates a . The oldest area in the diagram is .

Revolt · Accepted Answer

subduction; Selection 1: subduction; Selection 2: deep-ocean trench; Selection 3: B

Question 8

mid-ocean ridgevolcano✔ deep-ocean trench

Revolt · Accepted Answer

deep-ocean trench

Question 9

A✔ BCD

Revolt · Accepted Answer

B

Plate Tectonics Answers

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