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basaltic lava

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basaltic lava [bə′sȯl·tik ′lav·ə]
(petrology)
A volcanic fluid rock of basaltic composition.


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The crater floor and the northwestern part of the imaged region are remarkably flat and have been formed by sediments and basaltic lava flows originating from the Tharsis volcanic region.
Thus, "Fashioned by Time" includes photos of glacial erratics in Norway, weathered granite in South Africa, chunks of basaltic lava in the Galapagos Islands rounded by Pacific surf, almost spherical boulders on a Cape Breton Island beach, and windblown sand grains in an ancient Newfoundland limestone.
Rock samples obtained via dredging, submersible operations, and drilling confirm that the top of the oceanic crust, where it is not obscured by sediments, is composed of basaltic lava that originates in the mantle.
 
 
 
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