What does new oceanic lithosphere forms as a result of?

New oceanic lithosphere is created as the result of lava spewing from mid-ocean ridges and fissures in the ocean. (Side-note: Old oceanic lithosphere is subducted into the mantle at subduction zones.)

343^x = 49^4-xx = 4-xx+x=42x = 4x = 4/2x = 2therefore x = 2

The correct answer is:   [b]:   "physical systems" .