Assertion: lithium | /r/AtLocation | the earth's crust
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Source sentences:
text: But lithium is also quite rare, and is usually present only in small concentrations where it is found in the Earth's crust.
text: First discovered in 1817, according to a May 2019 article published in Biological Trace Element Research, lithium is found in the earth's crust and when in solid form is one of the least dense elements.