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WordNet-Online
Definitions from WordNet | ||||
Definitions from the WebLower MantleDefinition: The region of the Earth's mantle located between the core-mantle boundary and the upper mantle. Part of Speech: Noun Sense 1: In geology, the lower mantle refers to the solid layer of silicate material below the Earth's crust. Example sentence: The lower mantle is believed to consist mainly of solid rock, extending to a depth of about 2,900 kilometers. Sense 2: In seismology, the lower mantle refers to the area below the transition zone where seismic waves travel through. Example sentence: Seismic waves passing through the lower mantle experience changes in speed and direction due to the varying properties of the rocks. Related Products: | ||||
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