According to geographical analysis, the volume of groundwater that flows over a given time per unit area through a body of rock or sediment is called the "<u>hydraulic head</u>."
This is because the hydraulic head is based upon the gradient of the water table, including the permeability of the rock or sediment and groundwater thickness.
Hydraulic head is calculated in the form of liquid surface elevation.
Hydraulic head is usually expressed in units of length.
Hence, in this case, it is concluded that the correct answer is "<u>hydraulic head</u>."
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The answer is thunderstorm because using process of elimination, a thunderstorm is the only natural disaster that would produce lighting. By the way you put all the answers as a. Hope this helps!
Abyssal plain- the broad, flat part of the deep-ocean
Zinc and petroleum would be the best aswer.
