Salem investigates the reaction of 5 different metals with diluted nitric acid, which variable should he changes in his investigation? * concentration of the acid
mass of the metals
volume of the acid
type of the metal

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

hope i !

answersilicon (si); oxygen (o);