Continental Drift & Sea-Floor Spreading

Folded moutains in South America and Africa are which type of evidence?

In 1910, a scientist named __________ was curious about why some continents look like they could fit together.

Which was NOT used by Wegener as evidence of continental drift?

The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again.

The mesosaurus fossils found in South America and Africa are which type of evidence?

Seams that form mountain ranges that run along the middle of ocean floors.

Because Wegener could not identify the cause of continental drift, most geologists _______ his idea.

With sonar, scientists found that mid-ocean ridges extend into all of Earth’s _________.

Any trace of an ancient organism that has been preserved in rock.

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

Continents were joined together in a supercontinent, about _________ years ago.

Scientists use ________, which uses sound waves to measure the distance to an object.

According to Wegener, the continents were joined together in a(n) _____________.

The continents are no longer drifting.

What substance emerges up through a mid-ocean ridge?

Wegener’s idea that the continents slowly moved over Earth’s surface.

Wegener called the supercontinent _____________.

During subduction, the ocean floor plunges into deep underwater canyons. These canyons are called __________ .

During sea-floor spreading, lava cools into new ocean floor and the older ocean floor gets pushed __________.

The mid-ocean ridges form the _______ mountain ranges on Earth.