Assertion: natural uranium | /r/AtLocation | the earth's crust
Facets:
Source sentences:
text: Natural uranium as found in the Earth's crust is a mixture largely of two isotopes: uranium-238 (U-238), accounting for 99.3% and uranium-235 (U-235) about 0.7%.
text: Natural' uranium as found in the earth's crust is a mixture largely of two isotopes: uranium-238 (U-238), accounting for 99.3 percent and U-235 about 0.7 percent.