17-1 Tectonic Plates

Who was the first person to propose the idea of continental drift?

• Cynognathus

• Juan de Fuca

• Alfred Wegener

• Abraham Ortelius

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

• Pangaea

• Nazca

• Antorati

• Scotia

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What evidence did Wegener use to support his continental drift hypothesis?

• Matching mountain ranges

• All of the above

• Similar rock types

• Fossils of Glossopteris

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Why was Wegener's continental drift hypothesis initially rejected by the scientific community?

• All of the above

• Inability to explain how continents move through solids

• Inability to explain the forces causing movement

• Lack of evidence

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What technological advance was used to study the ocean floor?

• Survey ship

• Sonar

• Magnetometer

• All of the above

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What did scientists discover about the ocean floor using sonar and magnetometers?

• Deep-sea trenches

• Underwater mountain chains called ocean ridges

• Magnetic patterns that matched known patterns of reversals

• All of the above

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What is the study of the history of Earth's magnetic field called?

• Continental drift

• Magnetism

• Seafloor spreading

• Paleomagnetism

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How do scientists determine the age of the ocean floor?

• By studying magnetic patterns on the seafloor

• By analyzing the composition of rocks

• By measuring the depth of the ocean

• By studying fossils found on the ocean floor

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What is seafloor spreading?

• The theory that explains how new ocean crust is formed at ocean ridges

• The process of oceanic crust being destroyed at deep-sea trenches

• The movement of continents through solids

• The process of magma solidifying and adding new ocean floor

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What is the deepest trench on Earth?

• East Pacific Rise

• Juan de Fuca Ridge

• Challenger Deep

• Mariana Trench

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