Module 13 Plate tectonics

Question 1

Rock samples taken near ocean ridges are older than rock samples taken near deep-sea trenches.

Accepted Answer

False

Question 2

Where are most divergent boundaries found?

Accepted Answer

on the seafloor

Question 3

Earthquake activity and volcanism are common along ocean ridges.

Accepted Answer

True

Question 4

Places where tectonic plates come together are called

Accepted Answer

convergent boundaries

Question 5

These maps have shown the ocean floor is ________ near ocean ridges and _______ near deep sea trenches

Accepted Answer

younger, older

Question 6

Places where tectonic plates move apart are called

Accepted Answer

divergent boundaries

Question 7

Fossils of aquatic reptiles found in freshwater rocks suggested to Wegener that these reptiles

Accepted Answer

probably did not cross the oceans

Question 8

Minerals containing this act like small compass needles and record the orientation of Earth’s magnetic field @ formation

Accepted Answer

iron

Question 9

The Mid-Atlantic Ridge is an example of a

Accepted Answer

divergent boundary

Question 10

Which of the following landforms results from divergence of continental crust?

Accepted Answer

a rift valley

Question 11

This type of line connects points on a map that have the same age

Accepted Answer

isochron

Question 12

The theory of seafloor spreading explains that Earth’s continents move because they ride atop ocean crust

Accepted Answer

True

Question 13

Was constructed from data gathered from continental basalt flows

Accepted Answer

geomagnetic time scale

Question 14

What happens along a divergent boundary on the seafloor?

Accepted Answer

new ocean crust forms

Question 15

Device that can detect small changes in magnetic fields

Accepted Answer

magnetometer

Question 16

To support his hypothesis of continental drift, Alfred Wegener did NOT use

Accepted Answer

magnetic field data

Question 17

Earth's ________ has changed over time.

Accepted Answer

magnetic field

Question 18

Magnetic data of the ocean floor has been used to generate ________ maps

Accepted Answer

isochron

Question 19

Early mapmakers thought continents might have moved based on their observations of

Accepted Answer

matching coastlines

Question 20

Convergent boundaries are classified according to the

Accepted Answer

type of crust involved

Question 21

The magnetic patterns on either side of a deep-sea trench are mirror images of each other.

Accepted Answer

True

Question 22

Which of the following features forms when two oceanic plates converge?

Accepted Answer

subduction zones

Question 23

At which tectonic plate boundary do plates slide horizontally past each other?

Accepted Answer

transform boundary

Question 24

The thickness of ocean-floor sediments decreases with distance from an ocean ridge.

Accepted Answer

False

Question 25

Tectonic plates interact at places called plate

Accepted Answer

boundaries

Question 26

Based on observations of fossils of Glossopteris, Wegener concluded that

Accepted Answer

continental rocks containing these fossils had once been joined

Question 27

Pangea was an ancient supercontinent made up of

Accepted Answer

All of Earth's continents

Question 28

Which feature is associated with a continental-continental plate boundary?

Accepted Answer

a mountain range

Question 29

Each cycle of spreading and magma intrusion along an ocean ridge results in the formation of this

Accepted Answer

new ocean crust

Module 13 Plate tectonics

Questions 29

Module 13 Plate tectonics

Questions 29