A search was underway Monday in Sequoia National Park for a 76-year-old California man on his first solo overnight backpack trek who failed to meet his family as planned last week.

Understanding the eruptive history of volcanoes in Hawaii requires a tremendous amount of time and effort examining deposits. Typically, older eruptions have less material exposed at the surface because younger eruptions bury them, or wind and rain erode them. Such is the case for one of Kīlauea’s largest explosive eruptions, which is not exposed near its source at the summit and must be studied further afield.

Retiring at day's end to a small cabin on the lakeshore, Henry David Thoreau spent two years searching for lessons nature could teach him.

Utah has no legal standing to second-guess President Biden's judgment in restoring the original boundaries of Bears Ears and Grand Staircase-Escalante national monuments in the state, a federal judge has ruled.