Slumgullion landslide. Photo: William Schulz, USGS, public domain.

Slow-Motion Landslides

Caitlin Dempsey

Not all landslides are sudden or fast-moving.

Physical weathering by waves at Arcadia National Park in Maine. Photo: John J. Mosesso, USGS. Public domain.

Physical and Chemical Weathering of Rocks

Caitlin Dempsey

Weathering is the breaking down of rock material by physical or chemical processes.

Australia’s Yarrabubba is the Oldest Impact Crater on Earth

Katarina Samurović

Recently published research indicates that the Yarrabubba impact structure in Australia may be the world's oldest.

This Detailed Map Shows 119 Years of Earthquakes

Caitlin Dempsey

The USGS has released a highly detailed and updated map of seismicity from 1900 to 2018.

Hoodoos at Bryce Canyon National Park. Photo: Bryce Canyon NPS, Public domain.

The World’s Highest Concentration of Hoodoos

Caitlin Dempsey

Hoodoos are tall, thin rock spires that occur all around the world.