Mercury has long been a mystery to scientists. Until recently, knowledge of the planet was limited to the grey, patchy landscape revealed by the Mariner 10 probe, NASA's first mission to Mercury in the mid-1970s.
Images gathered by University of Oregon scientists using seismic waves penetrating to a depth of 300 kilometers (almost 200 miles) report the discovery of an anomaly that likely is the volcanic mantle plume of the Galapagos ...
Spain's National Geographical Institute says the Canary Island of El Hierro has been rocked by more than 50 tremors in 24 hours, two years after a new volcano began to appear off its southern coast.
Climate change has not been strongly influenced by variations in heat from the sun, a new scientific study shows.
This Envisat image was acquired over the Westfjords peninsula in northwest Iceland.
Intriguing mounds of light-toned layered deposits sit inside Juventae Chasma, surrounded by a bed of soft sand and dust.
Rain as acidic as undiluted lemon juice may have played a part in killing off plants and organisms around the world during the most severe mass extinction in Earth's history.
Scientists working on a landmark U.N. report on climate change are struggling over how to address a wrinkle in the meteorological data that has given ammunition to global-warming skeptics: The heating of Earth's surface appears ...
A volcano off New Zealand sent a plume of steam two kilometres (1.24 miles) into the air Tuesday, although volcanologists described the eruption as small and said it was over in minutes.
Residents in a southern Japanese city accustomed to frequent eruptions from a nearby volcano were busy washing ash off the streets Monday after the mountain spewed a record-high smoke plume into the sky.