19.1-19.4 Review

How do scientists use seismic waves to make detailed maps of Earth's interior?

• By measuring the color of the waves

• By studying what happens to the waves on their path through Earth

• By counting the number of earthquakes

• By observing the weather patterns

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What type of crust lies under the oceans?

• Oceanic crust

• Continental crust

• Mantle

• Core

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What is the continental crust mostly made of?

• Granite and basalt

• Basalt and iron

• Iron and nickel

• Aluminum and silicon

Why do more dense materials settle toward the center of the Earth?

• Gravity pulls them inward

• They are lighter

• They are heated

• They float on water

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What is the main composition of Earth's inner and outer cores?

• Iron

• Aluminum

• Basalt

• Granite

What process develops because less dense materials rise and more dense materials sink in the mantle?

• Convection

• Radiation

• Conduction

• Evaporation

What is the average thickness of continental crust?

• 10 km

• 20 km

• 30 km

• 50 km

What does the theory of plate tectonics describe?

• How pieces of Earth's surface move

• How weather changes

• How plants grow

• How rivers form

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Who helped develop the theory of plate tectonics?

• Albert Einstein

• Isaac Newton

• Harry Hess

• Charles Darwin

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While serving as a Navy officer, what did Harry Hess help map?

• The Amazon Rainforest

• The ocean floor

• The Sahara Desert

• The Himalayan Mountains