Answer: 8 planets
Explanation:
There are 8 planets in our solar system, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. There are 9 if you count Pluto, but it is most of the time not included.
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>."
Learn more here: brainly.com/question/14344860
This is an example of a closed system
