Earth s magnetic field.
Plate tectonics and the ocean floor quizlet.
Start studying oceanography chapter 2.
According to the theory earth has a rigid outer layer known as the lithosphere which is typically about 100 km 60 miles thick and overlies a plastic moldable partially molten layer called the asthenosphere the lithosphere is broken up into seven very large continental and ocean sized plates six or seven medium sized regional.
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Why was the mapping of the ocean floor such an important step in the development of plate tectonic theory.
Tectonicus from the ancient greek.
Linked pieces of lithosphere which float atop the asthenosphere.
The ocean floor had tracks from the continents.
Nobody had known how deep the oceans were.
In these situations an oceanic plate normally subducts into the mantle forming a topographic low on the ocean floor.
All this evidence both from the ocean floor and from the continental margins made it clear around 1965 that continental drift was feasible and the theory of plate tectonics which was defined in a series of papers between 1965 and 1967 was born with all its extraordinary explanatory and predictive power.
A mid ocean ridge or mid oceanic ridge is an underwater mountain range formed by plate tectonics.
Plate tectonics and the ocean floor.
9th 12th grade.
Ocean trenches form where a plate with a leading edge of oceanic lithosphere collides with another plate.
Most plate boundaries are under the ocean.
According to the theory of plate tectonics the plates are moved by the creation of new crust and the subduction of old crust.
Composed of either continental or continental and oceanic lithosphere significantly more plastic than the rigid asthenosphere atop which they float.
The features mapped on the ocean floor disproved continental drift.
This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the.
The process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle is known as answer choices.
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