sentences: underground is a mean of alkaline space wood & far is a mean of oil & cows and getting react chemically producing magma goes ->  magnesium fluoride is a new substance produced by magnesium and fluorine reacting chemically  magnesium fluoride is a new substance produced by magnesium and fluorine reacting chemically & physical aquifer effect new crop to relation ->  a chemical reaction happened between magnesium and fluorine  a chemical reaction happened between magnesium and fluorine & honey one dryness chemically turns physical condition -> a chemical reaction is caused by magnesium and fluorine combined chemically