When a fire extinguisher is opened, the compressed carbon dioxide forms ice crystals around the nozzle, providing a visual example of the physics principle that gases and plasmas cool as they expand.

Last year was one of the worst years on record for the Greenland ice sheet, which shrunk by hundreds of billions of tons.

Look around. Can you see the air? No? Luckily, many of NASA's Earth-observing satellites can see what the human eye can't -- including potentially harmful pollutants lingering in the air we breathe.

Earth’s molten core may be leaking iron, according to researchers who analyzed how iron behaves inside our planet.

A new study finds volcanic activity played a direct role in triggering extreme climate change at the end of the Triassic period 201 million year ago, wiping out almost half of all existing species.

At the regional level and worldwide, the occurrence of large shallow earthquakes appears to follow a mathematical pattern called the Devil’s Staircase, where clusters of earthquake events are separated by long but irregular intervals of seismic quiet.

Drought and heat put stress on plants and reduce grain yield. 

The first sign of trouble for a patient with a growing brain tumor is often a seizure.

Flamingos form friendships that last for years, new research shows.

In Europe's temperate forests, less common plant species are being replaced by more widespread species.