Chapter 5 / Lesson 4: Evidence for the Mechanism of Continental

What are the plates of the Earth's crust?

• 1. Another word for the continents.

• Paper plates
• 1. Another word for the continents.

• 1. Large pieces of lithosphere that fit together like a jigsaw puzzle.

Why was seafloor spreading an important discovery?

• It proved that the Earth is flat.
• It confirmed the existence of mermaids.
• It demonstrated that the moon is made of cheese.
• 1. It provided an explanation for how the plates could move.

What discovery was NOT made from mapping the ocean floor?

• 1. Magnetic immobility

• 1. Underwater volcanoes

• 1. Seafloor spreading

• 1. Magnetic stripes in ocean rock

What was the main discovery when people began mapping the ocean floor after World War II?

• 1. A mid-ocean ridge that ran through the Atlantic Ocean.

• 1. Extinct volcanoes.

• 1. Sunken submarines.

• 1. Broken crust from continents moving.

When scientists found identical patterns on either side of the mid-ocean ridge, what did they deduce?

• 1. That one of these patterns repeated the first one, due to magnetic reversals.

• 1. That these patterns were formed at the same time and that they moved away from one another

• 1. That these patterns were formed at the same time, due to seafloor spreading.

• 1. That these patterns were man made.