science question and answer for chapter 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| what evidence did Wegener find for Pangaea? | he found evidence from land features, fossils, and climate.
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| why was Wegener's hypothesis rejected? | because he could not give a satisfactory for "why." (the force that pushes or pulls the continents.
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| what are mid-ocean ridges? | long chains of mountains that rise up from the ocean floor.
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| what is sea-floor spreading? | sea-floor spreading adds more crust to the ocean floor. At the same time, older strips of rocks move outward from either side of the ridge.
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| what is evidence of sea-floor spreading? | evidence from ocean material (molten material), evidence from magnetic stripes, and evidence from drilling samples.
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| what happens at deep-ocean trenches? | the oceanic crust bends backward. in a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches.
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| what is subduction? | the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again.
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| what is the theory of plate tectonics? | the theory of plate tectonics states that Earth's plates are in slow, constant motion, driven by convection currents in the mantle.
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