This aerial view shows the Colorado River, south of Las Vegas, on February 6, 2020. (Photo by DANIEL SLIM/AFP via Getty Images) At a Glance Viewing the color of an entire river from space can reveal a lot about water quality, a new study says.The team found that 56% of their observations were dominantly yellow. Another 38% were dominantly green. No man ever steps into the same river twice, according to an ancient Greek philosopher. Nearly 2,500 years later, satellites...

The lava depth at the summit of Kilauea rose 75 feet in 24 hours. The lava lake is seen here on Hawaii’s Big Island on Wednesday, Dec. 23, 2020. (Twitter/@USGSVolcanoes) The newly-formed lava lake in Mount Kilauea's Halema'uma'u crater , USGS Volcanoes tweeted on Wednesday. The volcano on Hawaii's Big Island began erupting Sunday night and continued Wednesday. The volcano's aviation alert status has been since Monday. were also observed after the initial eruption on Sunday, according to USGS. (MORE:...

The River Great Ouse bursts its banks on Saturday, December 26, 2020, in Bedford, England. Many people in homes and properties were advised to move out, as a "severe" flood warning was in place. (Photo by Dan Kitwood/Getty Images) At a Glance High winds and flooding slam many parts of the United Kingdom.Thousands of residents are forced to flee rising rivers.Falling trees and flooding blocks rail lines. A dangerous winter storm has brought high winds and widespread flooding to much...