Pressure from a pool of magma has just cracked solid rock, creating a volcano-tectonic ... tectonic plates at plate boundaries, such as the San Andreas fault and the Mid-Atlantic Ridge).

Plate tectonic theory shows that the crust of ... forming shallow-sided volcanoes. The Mid-Atlantic Ridge on the floor of the Atlantic Ocean, where the Eurasian and North American Plates are ...

Mid-ocean ridge basalts (MORBs), located far from subduction zones, are typically thought to be unaffected by subduction ...

However, a groundbreaking Earth’s crust discovery project drilled over a mile deep into the crust near the Atlantis Massif at the Mid-Atlantic Ridge ... mysteries of plate tectonics and mantle ...