Mass extinctions of land-dwelling animals occur in 27-million-year cycle

Credit: CC0 Public Domain Mass extinctions of land-dwelling animals—including amphibians, reptiles, mammals, and birds—follow a cycle of about 27 million years, coinciding with previously reported mass extinctions of ocean life, according to a new analysis published in the journal Historical Biology. The study also finds that these mass extinctions align with major asteroid impacts and […]

Toward an understanding of when and how slope failure may occur — ScienceDaily

Across the western U.S., severe wildfires fueled by tinder-dry vegetation have already burned more than 3.2 million hectares (8 million acres — an area the size of Maryland —  as of th end of October, 2020, and nearly six times that area burned this year in Australia. And even though neither country’s worst-ever fire year […]