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Instructions
For the Student:
Read the definitions below, then label the seafloor spreading (plate divergence) diagram.
Extra Information
Word Bank
Upper Mantle (rigid): the uppermost part of the mantle, part of the lithosphere.
Oceanic Ridge: newly-formed region of the oceanic crust.
Ocean: large bodies of water sitting atop oceanic crust.
Magma: molten rock withing the Earth’s mantle. In seafloor spreading, magma moves from the asthenosphere to the crust.
Lower Mantle (semi-rigid): the deepest parts of the mantle, just above the core.
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).
Lithosphere: the crust plus the rigid, upper mantle.
Oceanic Crust: thin parts of the Earth’s crust located under the oceans.