Why do humans lack hair in the lips, nipples, external reproductive organs, palms of hand and soles feet?

Because hair follicles  that present on all skin surfaces except palms, soles, lips, nipples, parts of external reproductive organs.

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.