Continental Drift/Seafloor Spreading Question Preview (ID: 41352)


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The ancient, landmass that contained all of the continents is called _____.
a) Pangaea
b) Laurasia
c) Gondwanda
d)

What hypothesis states that continents slowly moved to their present positions on Earth?
a) seafloor spreading
b) subduction
c) continental drift
d)

Scientists know that the plates move a few centimeters to a few inches per _____.
a) 10 years
b) year
c) 100 years
d)

Fossils of mesosaurus, an early land-dwelling reptile, have been found in South America and South Africa. The locations of these fossils suggest that these areas were once _____.
a) connected to one another
b) covered by oceanic crust
c) made of the same chemical elements
d)

_____ developed the theory of Continental Drift.
a) Alfred Wegener
b) Harry Hess
c) Albert Einstein
d)

The presents of the same _____ on several continents supports the idea of Continental Drift.
a) fossils
b) rocks
c) glacial evidence
d) all of the above

The thing that Wegener observed was the puzzle-like fit of _____.
a) North America and South America
b) South America and Asia
c) South America and Africa
d)

Why did most scientists not believe Wegener's theory?
a) Wegener did not know what caused the similar rock formations.
b) Wegener could not prove the how or why the continents moved.
c) Wegener found fossils of warm plants in warmer climates.
d)

Who proposed the theory of Seafloor Spreading?
a) Harry Hess
b) Alfred Wegener
c) W. Jason Morgan
d)

Which was a piece of evidence to support the theory of Seafloor Spreading?
a) The entire seafloor was the same age and type of rock.
b) Younger rocks were found at the mid-ocean ridge, while older rocks were found at subduction zones.
c) Older rocks were found at the mid-ocean ridge, while younger rocks were found at subduction zones.
d)

Seafloor spreading occurs because _____.
a) earthquakes break apart the ocean floor
b) new material is being added to the mantle
c) molten material beneath the seafloor rises to the surface
d)

Bands of rock on the seafloor showing alternating bands of magnetism tells us that Earth's magnetic field _____
a) reversed itself in the past
b) weakened
c) remained the same
d)

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