Plate Tectonics: Question Preview (ID: 5969)

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Which of the following best describes Earth's mantle?
a) the densest of Earth's layers
b) the home of all life on Earth
c) the thickest layer of hot rock
d) the thinnest and hottest layer

Tectonic plates make up Earth's
a) lower mantle
b) lithosphere
c) asthenosphere
d) inner core

Why did many scientists reject Wegener's continental drift hypothesis?
a) He could not explain how the continents moved.
b) The geology of continents did not support his hypothesis.
c) Fossil evidence showed that the continents were never joined.
d) The climates of the continents have remained the same.

What evidence from the sea floor shows that tectonic plates move?
a) The sea floor is much older than any of the continents.
b) The sea floor is youngest near a mid-ocean ridge and older farther away.
c) Mid-Ocean ridges circle Eqarth like seams in a baseball
d) The sea floor is thinner than continental crust.

A Mid-Ocean ridge forms where plates
a) move apart
b) push together
c) scrape past each other
d) subduct

Plate motion is caused partly by
a) magnetic reversals
b) convection currents
c) continental drift
d) volcanic hot spots

Which of the following is formed at the collision zone?
a) deep ocean trench
b) volcanic island chain
c) mountain range
d) continental rift valley

What happens when two oceanic plates meet?
a) Both plates sink into the asthenosphere.
b) The colder, denser plate sinks.
c) Both plates fold the rock between them.
d) One plate slides past the other.

Where is crust neither formed nor destroyed?
a) mid-ocean ridge
b) continental rift valley
c) transform boundary
d) subduction zoned

Earthquakes are MOST LIKELY to occur at the borders of
a) continents.
b) lithospheric plates.
c) countries
d) oceans

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