A new study by geologists at the Woods Hole Oceanographic Institution (WHOI), MIT, and elsewhere has found that colliding continental plates may draw down more water than previously thought. The results could help to explain the explosiveness of some volcanic eruptions, as well as the distribution of ore deposits such as copper, silver, and gold. The findings are based on an analysis of ancient magmatic rocks recovered from the Himalayan mountains — a geologic formation that is the product of a subduction zone, where two massive tectonic plates have crushed…