Earth Structure Ch. 3 Review

Question 1

A place where plates move apart from each other is a

Accepted Answer

divergent boundary

Question 2

The lithosphere is broken into sections called ______ that float on top of the asthenosphere.

Accepted Answer

plates

Question 3

A collision between two pieces of continental crust produces a

Accepted Answer

mountain range

Question 4

The theory that Earth's lithosphere is in constant slow motion is called

Accepted Answer

plate tectonics

Question 5

What did scientists use in the mid-1900s to map the mid-ocean ridges?

Accepted Answer

sonar

Question 6

New oceanic crust is

Accepted Answer

hot

Question 7

Deep underwater canyons are also called

Accepted Answer

deep-ocean trenches

Question 8

A trace of an ancient organism that has been preserved in a rock is called a

Accepted Answer

fossil

Question 9

The process by which the ocean floor sinks back into the mantle is

Accepted Answer

subduction

Question 10

Mountain ranges that run along the middle of some ocean floors are called

Accepted Answer

mid-ocean ridges

Question 11

What is Pangaea?

Accepted Answer

Supercontinent

Question 12

A place where plates come together and collide is a

Accepted Answer

convergent boundary

Question 13

When continental plates pull apart at a divergent boundary on land, a __________ forms.

Accepted Answer

rift valley

Question 14

Most geologists think that the movement of Earth's plates is caused by

Accepted Answer

convection currents

Question 15

A place where two plates slip past each other, moving in opposite directions is known as a

Accepted Answer

transform boundary

Question 16

The process in which mid-ocean ridges continually add new material to the ocean floor is

Accepted Answer

sea-floor spreading

Question 17

Old oceanic crust is

Accepted Answer

cool

Questions 17