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Label Seafloor Spreading
Plate Tectonics Page
Read the definitions below, then label the seafloor spreading (plate divergence) diagram.
Seafloor spreading to label

Lithosphere - the crust plus the rigid, upper mantle.
Lower Mantle (semi-rigid) - the deepest parts of the mantle, just above the core.
Magma - molten rock withing the Earth's mantle. In seafloor spreading, magma moves from the asthenosphere to the crust.
Ocean - large bodies of water sitting atop oceanic crust.
Oceanic Crust - thin parts of the Earth's crust located under the oceans.
Oceanic Ridge - newly-formed region of the oceanic crust.
Upper Mantle (rigid) - the uppermost part of the mantle, part of the lithosphere.
Asthenosphere = Upper Mantle (flowing) - the lower part of the upper mantle that exhibits plastic (flowing) properties. It is located below the lithosphere (the crust and upper mantle).

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