All Stories by Beth Geiger
- Animals
Extreme climate shifts long ago may have helped drive reptile evolution
The end-Permian extinction left reptiles plenty of open ecological niches. But rapid climate change may be what kick-started the animals’ dominance.
- Earth
Here’s how ice needles sculpt patterns into cold, rocky landscapes
Striking stone patterns decorate remote, frigid landscapes. The recipe for these naturally forming stripes and swirls: Freeze, thaw, repeat.
- Earth
An enormous supervolcano may be hiding under Alaskan islands
A geologic game of connect the dots reveals hints that Mount Cleveland, the Aleutians’ most active volcano, may sit on a giant undersea crater.
- Earth
You’re living in a new geologic age. It’s called the Meghalayan
The newly defined Meghalayan Age began at the same time as a global, climate-driven event that led to human upheavals.
- Ecosystems
Earth’s dry zones support a surprising number of trees
A Google Earth-based estimate of dryland forests adds serious leafage to Earth’s total tree count.
- Earth
Stunning images reveal glacial landscapes under the oceans
The most detailed atlas of the seafloor ever compiled offers colorful imagery and ghostly glimpses of Earth’s glacial past.
- Earth
Mount St. Helens is a cold-hearted volcano
Geophysics reveals that deep beneath Mount St. Helens, there’s no source of hot magma, just a wedge of cold serpentinite rock. Where is the missing heat?
- Earth
Remnants from Earth’s birth linger 4.5 billion years later
Shaken, not stirred: Tungsten isotopes reveal that mantle convection has left some remnants of ancient Earth untouched for 4.5 billion years.
- Paleontology
New tyrannosaur bridges gap from medium to monstrous
Horse-sized Timurlengia euotica had a brain and ears like its bigger relative Tyrannosaurus rex, which lived millions of years later.
- Oceans
3.5 billion years ago, oceans were cool, not hot
Extensive new evidence from South Africa suggests that 3.5 billion years ago, Earth was locked in a cold spell, with isolated blasts of hydrothermal heat that may have helped incubate life.
