When volcanoes like Alaska’s Mount Spurr erupt, the ash can damage people’s lungs, smother crops and kill animals, and the ...

As the volcanic ash settles back to Earth, it accumulates in layers that typically decrease in thickness with distance from ...

As the volcanic ash settles back to Earth, it accumulates in layers that typically decrease in thickness with distance from ... as the 1991 eruption of Mount Pinatubo in the Philippines ...