The Key To Sea Floor Spreading

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The key to sea floor spreading.

Wherever continents are bordered by deep sea trench systems as in the pacific ocean the ocean floor is plunged downward underthrusting the continents and ultimately reentering and dissolving in earth s mantle from which it had originated. Similar to wegener s theory that continents do in fact move hess seafloor spreading contradicted wegener s continental drift in that it involved the ocean sea floor moving as it expanded instead of continents ploughing through the sea. The oceanic crust is composed of rocks that move away from the ridge as new crust is being formed. Sea floor spreading answer key this is a mid ocean ridge.

The formation of the new crust is due to the rising of the molten material magma from the mantle by convection current. Divergent boundary linear feature that exists between two tectonic plates that are moving away from each other. The process that continually adds new material to the ocean floor is called sea floor spreading 9. Wikimedia commons has media related to sea floor spreading.

Some of the worksheets for this concept are sea floor spreading work inside earth work name date sea floor spreading l 1 2 3 a model of seafloor spreading sea floor spreading sea floor spreading modeling sea floor spreading chapter 8 plate tectonics. Molten rock pushes up from the asthenosphere and pushes the plates apart at the mid ocean r. It is an underwater mountain range that forms when magma pushes up on the crust at a divergent boundary. The mid ocean ridge is the region where new oceanic crust is created.

Seafloor spreading occurs along mid ocean ridges large mountain ranges rising from the ocean floor. The mid atlantic ridge for instance separates the north american plate from the eurasian plate and the south american plate from the african plate the east pacific rise is a mid ocean ridge that runs through the eastern pacific ocean and separates the pacific plate from the north american. The process by which the ocean floor sinks into the mantle is called subduction 10. A chain of underwater mountains along which sea floor spreading occurs is a mid ocean ridge.

Molten rock pushes up from the asthenosphere and pushes the plates apart at the mid ocean r. Sea floor spreading answer key this is a mid ocean ridge. See also continental drift a veritable legion of evidence supports the seafloor spreading hypothesis. The feature on the ocean floor at c is called a n ocean trench 8.

Vine matthews morley hypothesis the first key scientific test of the seafloor spreading theory of continental drift and plate tectonics. Seafloor spreading is happening at b. The process of sea floor spreading.