When referred to as a gas, it means a volatile has transitioned into the vapor phase. The most common gases (or vapor phase volatiles) emitted at the surface are water (H2O), carbon dioxide (CO2), and ...
Deep in New Mexico's Zuni Mountains, researchers have been studying an unusual desert feature: a cave that remains frozen ...
Rising into the warm light of the Mexican sunrise, the ancient city of Teotihuacan slowly came into view below. From the hot ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results