Theory of Plate Tectonics

What is the process that continually adds new crust to the ocean floor along both sides of the mid-ocean ridge?

• subduction

• continental drift

• convergent

• sea floor spreading

Magnetic bands on the ocean floor are evidence that Earth’s magnetic field changes.

• TRUE

• FALSE

The American geologist who proposed the theory of sea-floor spreading is

• Alfred Wegener

• Albert Einstein

• Harry Hess

• Elon Musk

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NGSS.MS-ESS2-3

According to Wegener's theory of continental drift,

• Earth's surface is made up of seven major landmasses

• the continents do not drift

• Earth is slowly cooling and shrinking

• the continents were once joined together in a single landmass and have slowly moved.

What is Pangea?

• the name of a German scientist

• the name of a supercontinent that existed millions of years ago

• another name for continental drift

• the name of an ancient fossil

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Which feature is associated with the letter N?

• Mid-Ocean Ridge

• Trench

• Continental Plate

• Subducting Plate

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Which of the following is the best evidence that Earth's continents were once in vastly different positions than they are today?

• Penguins are found only in the Southern Hemisphere

• Fossils of tropical plants are found in Antartica

• Volcanoes encircle the Pacific Ocean

• Major rivers form deltas from continental erosion

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NGSS.MS-ESS2-3

On the Atlantic Ocean Floor, there is a long ridge of underwater mountains caused by volcanic eruptions. New volcanoes keep erupting and new mountains keep forming. Why is this happening?

• A new continent is forming

• The ocean floor is spreading

• Earth's center is becoming hotter

• Crustal plates are colliding

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NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Which landform would most likely be created when two oceanic plates converge?

• A volcanic island arc

• a large watershed

• a smooth Continental shelf

• A chain of Continental mountains

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NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Most scientists believe that Earth's crust is composed of plates. There are two kinds of crust. Oceanic crust is more dense, on average, than Continental crust. Accordingly, what would most likely happen if a plate of oceanic crust and a plate of Continental crust collided?

• The oceanic crust would sink below the continental crust

• The oceanic crust would ride above the continental crust

• The continental crust would sink below the oceanic crust

• The continental crust would become thinner than the oceanic crust