Nitrogen-fixing bacteria in soil can convert excess nitrogen into which can contaminate groundwater.
a/an forms around a well when the water table begins to slope toward the well.
the water in an artesian well comes from a/an aquifer.
a well not only has to reach the but also has to go deeper.
in most aquifers, the materials that make up the aquifer are relatively which means they aren't chemically reactive.
aquifers are more prone to pollution.
the two primary components of a septic system are a septic tank and a/an
groundwater that comes to the surface naturally is known as a/an