The answer would be that president Nixon resigned in 1974 after the Watergate Scandal.
Answer:
Gypsum
Explanation:
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO. 2H2O. It's used in many forms of plaster, blackboard/sidewalk chalk, and drywall :)
Creo que es natural
(sorry if my Spanish is bad, I'm still learning)
