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Q/A science

science question and answer for chapter 3

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.
Created by: basketball_12