Exploring Sea Floor Spreading and Continental Drift

The video tutorial introduces the concept of seafloor spreading, building on Alfred Wegener's theory of continental drift. It explains how sonar technology revealed the ocean floor's topography, including mid-ocean ridges. The process of seafloor spreading, proposed by Harry Hess, is detailed, showing how magma rises to form new crust, pushing older crust away. Evidence supporting this theory includes rock samples and magnetic clues, demonstrating the movement of the ocean floor.

What was the name of the supercontinent proposed by Alfred Wegener?

• Pangea

• Atlantis

• Laurasia

• Gondwana

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What technology allowed scientists to map the ocean floor?

• Radar

• Sonar

• Satellite Imaging

• GPS

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What did scientists discover about the ocean floor using sonar?

• It was flat and sandy

• It was filled with mountain ranges

• It was covered in coral reefs

• It was entirely made of basalt

What is the name of the mountain range found in the middle of the Atlantic Ocean?

• Antarctic Ridge

• Indian Ridge

• Mid-Atlantic Ridge

• Pacific Ridge

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NGSS.HS-ESS1-5

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Who proposed the concept of seafloor spreading?

• Alfred Wegener

• Harry Hess

• Marie Tharp

• Charles Darwin

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NGSS.HS-ESS1-5

NGSS.HS-ESS2-1

What happens to magma as it rises to the Earth's surface at mid-ocean ridges?

• It remains liquid

• It turns into gas

• It cools and forms new rock

• It evaporates

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NGSS.HS-ESS1-5

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What causes the oceanic crust to sink into the Earth?

• It is less dense

• It is hotter

• It is more dense

• It is lighter

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NGSS.HS-ESS1-5

What did rock samples from the ocean floor show about the age of rocks?

• Older rocks are closer to the mid-ocean ridge

• Younger rocks are closer to the mid-ocean ridge

• All rocks are the same age

• Rocks are older near the continents

Tags

NGSS.HS-ESS1-5

What do magnetic clues in the rocks indicate about the Earth's magnetic field?

• It is weakening

• It is getting stronger

• It flips and reverses

• It has always been the same

How do alternating bands of magnetic orientation support seafloor spreading?

• They suggest the ocean floor is shrinking

• They prove the ocean floor is melting

• They show the ocean floor is static

• They indicate the ocean floor is expanding

Tags

NGSS.HS-ESS1-5

NGSS.HS-ESS2-1