Continental Drift & Plate Tectonics #2

What is the main idea Wegner proposed with Continental Drift?

• The fossils found on Earth are evidence of change over time.

• Seafloor has spread the continents into separate landmasses.

• Continents float on a liquid layer that allows them to move.

• Continents were once a single landmass that drifted apart

This photo is a glacial groove from Ohio. Which of Wegener's evidence does it belong to?

• Similar mountains and rock layers

• Ancient climatic evidence

• Similar fern fossils

• Similar reptile fossils

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What observation did Wegener make that led him to develop the theory of continental drift?

• The seafloor has “magnetic stripes”.

• Continents appear to have once fit together.

• The ocean floor has long ridges of volcanic mountains.

• Earth’s magnetic poles have reversed polarity

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NGSS.HS-ESS1-5

Which statement does NOT summarize one of the lines of evidence used by Alfred Wegener?

• Glacial deposits indicate a different climatic condition.

• Similar geologic formations occur on both sides of Atlantic

• Similar fossils are found on widely separated continents.

• Bands of rock are older the farther away from ocean ridges

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How did the discovery of ridges convince the scientific community to accept Wegener’s ideas?

• The ridges proved his theory was a law.

• The ridges helped to explain plate movement.

• The ridges contained the oldest rocks on Earth.

• The ridges showed that earthquakes occur randomly.

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What does the “magnetic striping” of the sea floor indicate about Earth?

• The magnetic pole has switched from north to south poles.

• The age of the rocks on the sea floor varies.

• The rocks cooling from the magma have changed composition.

• The seafloor has an uneven surface.

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Which additional piece of evidence does Plate Tectonics have that Continental Drift did not?

• An explanation of what drives the motion

• Fossil Evidence

• Erosional features

• Rock correlations

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Where is new oceanic crust created?

• Oceanic trenches

• Subduction zones

• Convergent Boundaries

• Mid Ocean Ridges

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What is the primary force that drives the movement of the plates?

• Convection Currents

• Earthquakes

• Solar Energy

• Volcanoes

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NGSS.MS-ESS2-1

Why is continental crust so old compared to oceanic crust?

• Oceanic crust gets recycled when it reaches subduction zones

• Continental crust is never located near trenches

• Continental crust is usually located closer to ridges

• Oceanic crust gets recycled when it spreads to the ridges

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