Plate Tectonic Concepts

Who first said that the continents drifted?

• George Wegner

• Alfred Wegner

• George Pangaea

• Alfred Pangaea

Wegner's idea hat the continents were once together and have since drift is known as

• Contiental drift

• Plate Tectonics

• Pangaea

What is NOT a piece of evidence to prove continental drift occurred?

• Continents make up like a puzzle

• Fossils are found in locations that were once connected

• Tropical plant fossils were found in a cold location

• None of the above

Was Wegener's hypothesis on continental drift accepted or rejected?

• Accepted, he found enough evidence to proof it

• Rejected, he couldn't identify the cause of continental drift

What is the best way to describe mid-ocean ridges?

• flat

• mountainous

• smooth

• silky

What do scientists use to map out the ocean floor?

• sonar

• camera

• telescope

• binoculars

Where does sea-floor spreading start?

• Mid-ocean ridge

• Deep-ocean trench

• Mantle

What is one characteristic about the ocean floor near the mid-ocean ridge?

• Old

• Less Dense

• Cold

What does the ocean crust subduct into?

• Mid-ocean ridge

• Deep ocean trench

What does sea- floor spreading do to the earth?

• Change the size of the oceans

• Change the shape of the oceans

• Move continents

• all of the above