Assertion: fluorine | /r/HasProperty | the 13th
Facets:
Source sentences:
text: In the environment, fluorine, the 13th most abundant element in Earth's crust, typically settles within the soil and readily combines with soil, rock, coal and clay, according to Lenntech.
text: Fluorine is less common in stars than on Earth, where it is the 13th most frequently found element in the crust.