Mauna Loa, the world's largest active volcano, is the mighty giant of Hawaii that's still bubbling away, waiting to be explored.

A key site that monitors global carbon-dioxide emissions went offline for maintenance and will return later Wednesday, according to the National Oceanic and Atmospheric Administration.

The Pliocene epoch, which lasted from 5.3 million to 2.6 million years ago, was a consequential time in Earth's history. The ...

A winter storm will bring severe weather across Hawaii beginning on Thursday, with impacts expected until Saturday morning.

the observatory said. Hawaii Volcanoes National Park encompasses the summits of two of the world’s most active volcanoes: ...

The USGS Hawaiian Volcano Observatory spearheads Volcano Awareness Month each January on the Island of Hawaii. This year, in ...

The Hawaii Volcanoes National Park is home to the summits of two of the world’s most active volcanoes: Kilauea and Mauna Loa.

the observatory said.Hawaii Volcanoes National Park encompasses the summits of two of the world’s most active volcanoes: Kilauea and Mauna Loa.The eruption is visible from many public overlooks ...