Assertion: phosphorus | /r/AtLocation | phosphate form
Facets:
value: usually
type: DEGREE
value: always
type: TEMPORAL
Source sentences:
text: In nature, phosphorus is always found in combination with oxygen in the phosphate form.
text: Phosphorus is usually found in the form of phosphate but is used up quickly in nature because plants and animals need it to grow.
text: Phosphorus in natural waters is usually found in the form of phosphates (PO 4 -3).