Unit 2: Lesson 2 Developing a Theory Review

What device did scientists use to measure ocean depths during the late 1940s?

• Sonar

• Seismograph

• Echo sounder

• Radar

What did scientists use the collected data from the echo sounder to create?

• Astronomical maps

• Geological maps of continents

• Weather maps

• Topographic maps of the seafloor

What are mid-ocean ridges?

• Extensive mountain ranges in the middle of oceans

• Deep underwater troughs on the seafloor

• Large underwater caves

• Volcanic islands

Tags

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What are ocean trenches?

• Deep underwater troughs on the seafloor

• Extensive mountain ranges in the middle of oceans

• Large underwater caves

• Volcanic islands

Tags

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Where is the Mariana Trench located?

• Arctic Ocean

• Atlantic Ocean

• Pacific Ocean

• Indian Ocean

What is the Mariana Trench known for?

• Being the largest ocean on Earth

• Being the highest mountain on Earth

• Being the deepest landform on Earth

• Being the longest river on Earth

How deep is the Mariana Trench?

• Deep enough to fit the Eiffel Tower

• Deep enough to fit Mount Everest with six Empire State buildings stacked on top

• Deep enough to fit the Statue of Liberty

• Deep enough to fit the Great Wall of China

How did scientists determine the age of the seafloor?

• By analyzing rock samples from the ocean floor

• By measuring the temperature of the ocean water

• By studying the behavior of marine animals

• By examining satellite images of the seafloor

Tags

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What do isochron maps of the ocean floor show?

• Stripes across the seafloor parallel to mid-ocean ridges

• Random distribution of ages on the seafloor

• Circular patterns on the seafloor

• Spiral shapes on the seafloor

Tags

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What is seafloor spreading?

• The continuous formation and destruction of oceanic crust

• The eruption of underwater volcanoes

• The movement of continents across the seafloor

• The sinking of ocean trenches

Tags

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