'You find one of these at the point where an aquifer intersects the slope of a hillside'
a spring
THE EARTH: You find one of these at the point where an aquifer intersects the slope of a hillside
You find one of these at the point where an aquifer intersects the slope of a hillside
You find one of these at the point where an aquifer intersects the slope of a hillside
THE EARTH
a spring
THE EARTH