ferrous

"The mining company explored for metal ores in the remote mountain ranges. "

"strengthen a muscle"

"The oxidation of iron causes rust to form on metal objects. "

"The box containing my old toys was stored in the attic. "

"The heavy rain weakened the old wooden fence. "

"The doctor prescribed a new valence to treat the common cold virus, which was effective against several strains. "

"The label on the fertilizer bag listed ammonium sulfate as a key ingredient to help plants grow. "

"He helped his grandfather cook breakfast."

"My grandfather helped me with my math homework. "

"Zero, one, −1, 2.5, and pi are all numbers."

"The ancient Sumerians wrote laws and stories on clay tablets. "

""During the war, the refugees lived in guarded compounds for their safety." "