Chapter 10 Question Preview (ID: 46045)
10.
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Which process or processes change the size and shape of the oceans?
a) subduction only
b) sea-floor spreading only
c) both subduction and sea-floor spreading
d) both drilling for samples and subduction
In which areas does subduction of the ocean floor take place?
a) rift valleys
b) the lower mantle
c) mid-ocean ridges
d) deep-ocean trenches
What is the motion of Earth's plates like?
a) fast and in stages
b) slow and in stages
c) fast and constant
d) slow and constant
A ________________ boundary is when plates push together.
a) divergent
b) convergent
c) transform
d) mantle-crust
Which feature forms at convergent boundaries?
a) mountain range
b) trench
c) rift-valley
d) mid-ocean ridge
What forces causes the movement of Earth's plates?
a) pressure
b) sound-waves
c) convection currents
d) cooling
Diverging plates form a (n) __________.
a) mountain
b) volcano
c) island
d) rift valleys
What happens to new oceanic crust at a mid-ocean ridge?
a) it forms new mountains under the water
b) it climbs up the mantle to form a trench.
c) it gets hotter and sinks into a trench.
d) it is so dense that gravity pulls it into a deep-ocean trench.
What is one piece of evidence that caused Wegener to think that continents moved?
a) He found an old map of the world that showed movement.
b) He found similar fossils on different continents that are separated by oceans.
c) He proved his hypothesis with an experiment that measured movement.
d) He observed the continents moving with his own eyes.
Which of the following is evidence for sea-floor spreading?
a) matching patterns of magnetic stripes found in the crust of the ocean floor
b) new rock found farther from mid-ocean ridges than older rock
c) pieces of different rust found on different continents.
d) changes in climate on the continent of Africa
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