Beneath dormant volcanoes in the Cascades region of the Pacific Northwest, scientists found large reservoirs of magma. The discovery challenges the belief that active volcanoes have large magma ...

Map Source: TASA Graphic Arts ... The islands were formed as the Pacific plate crept northwest at three to four inches a year, carrying volcano after volcano away from the stationary hotspot ...

The volcanoes were found during an expedition to map the seafloor near the Cook Islands in the Central Pacific, about 2,900 miles (4,700 kilometers) south of Hawaii. If these structures are ...