How can groundwater flow, elevation can transport contaminates

it's under explanation

Explanation:Groundwater contamination occurs when man-made products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use. Materials from the land's surface can move through the soil and end up in the groundwater.

when it gains or loses electrons

are there options? cause you ain’t. real specific