Kenya and Tanzania were bracing Thursday for a cyclone on the heels of torrential rains that have devastated East Africa, killing more than 350 people and forcing tens of thousands from their homes.

Fourth-grader Ella Araza sat on a tiny plastic box in her Manila slum home, trying to finish her homework before the afternoon sun sent temperatures soaring to unbearable levels.

How often do mountains collapse, volcanoes erupt or ice sheets melt?

An unusual reduction in the strength of Earth's magnetic field between 591 and 565 million years ago coincided with a significant increase in the oxygen levels in the atmosphere and oceans, according to a paper published in Communications Earth & Environment. The authors propose that the weakening of the magnetic field may have led to the increase...

A team of paleoclimatologists with the U.S. Geological Survey, NASA Ames Research Park, has found that atmospheric rivers in the past have dumped far more rain on California than those that have occurred over the past two years.

In early spring, George Okoko was perched on a ledge 15 feet up a crumbly cliff, trying to whack off a basketball-size piece of rock with a hammer and chisel. The locale was suburban Berkeley Heights, N.J. The rock was basalt, a common product of volcanism. This batch formed some 200 million years ago, during vast eruptions that occurred as Europe slowly...