Answer:c prevent untreated sewage from contaminating groundwater
Explanation:That would mean the ground water would then be dirty and undrinkable
Hydrogen is the lightest element on the periodic table of elements. Hydrogen gas is always bonded to itself or something else to fill its outer shell. That is why hydrogen gas is represented as H2. Hydrogen<span> is odorless, colorless, and tasteless; therefore, it is undetectable by human senses.</span>
Answer:
i'd recommend rereading it
Explanation:
The amplitude of the waves decreases
The lower the sound volume is the lower the wave amplitude is.