Students are testing water from several locations for water pollution. Which location will most likely have the cleanest water

Iknow #2 is d. i just need to know why

Why are people not able to scuba dive in the deep part of the ocean

In water, a strong acid will break down into its component parts. a. completely b. partly c. never in water, a weak base will break down into its component parts. a. completely b. partly c. never