Assertion: compound's element | /r/AtLocation | igneous rocks of earth’s crust
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Source sentences:
text: The element is present in the igneous rocks of Earth’s crust to the extent of about 0.001 percent, which is scarce but not rare; its abundance is of the same order of magnitude as such technically useful elements as cobalt, nickel, copper, cerium, and lead, and it is essentially equal to the abundance of nitrogen.