No ocean-borne radiation from Japan’s Fukushima nuclear power plant disaster has yet been detected in analysis of kelp samples along the western U.S. coastline.
Here's why climbers use supplemental oxygen to climb Mount Everest. Also, the curtailment of the 2014 Everest climbing season following a deadly avalanche.
The vast Altiplano plateau in the South American Andes Mountains formed not gradually, but through rapid growth spurts, a new geological study suggests.