Assertion: kelp's mineral | /r/HasProperty | iron
Facets:
Source sentences:
text: Other minerals contained in kelp include iron, magnesium, copper, zinc and manganese.
text: Other minerals include phosphorus, iron, sodium, potassium, magnesium , chloride, copper, zinc, manganese , barium, boron, chromium , lithium, nickel, silver, titanium, vanadium , aluminum, strontium, bismuth, chlorine, cobalt, gallium, tin, and zirconium.