Sign up for CNN’s Wonder Theory science newsletter. Marley Parker/Woods Hole Oceanographic Institution Hydrothermal vents form where rising magma beneath the seafloor creates underwater mountain ranges called ocean ridges. It’s the third increase in depth for Alvin since the submersible was commissioned, according to Andrew Bowen, principal engineer at Woods Hole Oceanographic Institution’s Applied Ocean Physics & Engineering. Marley Parker/Woods …
