Why did the palestinian liberation organization set up bases in southern lebanon

To conduct raids across the border to Israel

Trust me it's right. ;) If this helped though help me with a like ;D

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.