Assertion: uranium | /r/AtLocation | most rocks
Facets:
Source sentences:
text: Uranium occurs in most rocks in concentrations of 2 to 4 parts per million and is as common in the Earth's crust as tin, tungsten and molybdenum.
text: Uranium is a fairly common metal, and occurs in most rocks in low concentrations of 2 to 4 parts per million.
text: It occurs in most rocks in concentrations of 2 to 4 parts per million and is as common in the earth's crust as tin, tungsten and molybdenum (What is Uranium?