Every national park has a story written in rock, water, and wildlife. USGS scientists are helping tell it. Across many parks, USGS scientists study changing ec

Every national park has a story written in rock, water, and wildlife. USGS scientists are helping tell it. Across many parks, USGS scientists study changing ecosystems, wildlife, water, and natural hazards. From tracking contaminants in aquatic food webs to monitoring glaciers, mapping river change…