Which change to the system would cause the freely-moving piston to lower? a) apply heat to the gas particles. b) reduce the atmospheric pressure. c) place the system in an ice bath. d) add more gas molecules to the system.

Place the system in an ice bath.. This would cool the particles and cause them to slow down. Then, they would exert less pressure, and the piston would fall.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

the answer would be d : p