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Q/A science
science question and answer for chapter 3
| Question | Answer |
|---|---|
| what evidence did Wegener find for Pangaea? | he found evidence from land features, fossils, and climate. |
| why was Wegener's hypothesis rejected? | because he could not give a satisfactory for "why." (the force that pushes or pulls the continents. |
| what are mid-ocean ridges? | long chains of mountains that rise up from the ocean floor. |
| 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. |
| what is evidence of sea-floor spreading? | evidence from ocean material (molten material), evidence from magnetic stripes, and evidence from drilling samples. |
| 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. |
| what is subduction? | the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again. |
| 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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