Review - Drifting Continents and Sea-Floor Spreading

Which features form the longest mountain ranges on Earth?

• The mid-ocean ridges

• The deep-ocean trenches

• The Rockies

• The Andes

Pangaea is the name of the supercontinent that Wegener suggested occur on Earth about 300 million years ago.

• True

• False

Which process adds more crust to the ocean floor?

• Suction

• Sea-floor spreading

• Subduction

• Magnetic stripe

Wegener inferred that the ancient plants Mesosaurus and Lystrosaurus once lived on a single landmass that has since split apart.

• True

• False

Where does subduction occur?

• Along the middle of some ocean floors

• Down the middle of mountain ranges

• On continents

• At deep-ocean trenches

Wegener used evidence from land features, fossils, and climate to support his theory of continental drift.

• True

• False

Which process or processes change the size and shape of the oceans?

• Subduction only

• Sea-floor spreading only

• Both subduction and sea-floor spreading

• Both drilling for samples and subduction

Oceanic drift is the idea that the Continents slowly moved over Earth”s surface.

• True

• False

Sonar is a device that scientists use to map the ocean floor.

• True

• False

Most geologists of Wegener’s time accepted his idea of drifting continents.

• True

• False