(a) describe one effect that acid deposition has on trees in a forest ecosystem. scientists are interested in how the severity of acid deposition affects the soil of the red spruce forests. they design a laboratory experiment in which rainwater of different ph values is used to water soil samples taken from red spruce forests. the soil samples are the same size and contain the same ratios of sand, silt, and clay. the same amount of water is sprayed on the soil samples every day for a week.