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Use "xenoliths" in a sentence
"The deep interior of the North American craton is known only from so-called xenoliths - rock inclusions in igneous rock - or xenocrysts such as diamonds that have been delivered to the surface from deep below by volcanoes."
"The rocks, called xenoliths, are from deep within Earth's mantle and crust, possibly more than 12 miles down."
"Usually a geologist can distinguish these "xenoliths" from the younger minerals around them."