Which option identifies what caused the damage in the following scenario? After a copper mine was established on the Tsolum River in Canada, a toxic substance seeped into the streams, killing 90% of the fish population.

acid mine drainage
greenhouse gas production
copper poisoning
waste heat

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

What are the two (02) benefits, which may result from a successful implementation of preventive maintenance (pm) program in an organization? (clo3)a)- lean manufacturing b)-overlapping responsibilities c)-the planner is not qualified d)-accurate contractor information e)-reduction in equipment redundancies f)-accurate stores information

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0