Total natural gas rig count in the US (including conventional gas drilling) Shale gas is natural gas that is found trapped within shale formations. Shale gas has become an increasingly important source of natural gas in the United States since the start of this century, and interest has spread to potential gas shales in the rest of the world.
A stressor is a chemical or biological agent, environmental condition, external stimulus or an event that causes stress to an organism.[1]
Stressors are events or conditions in your surroundings that may trigger stress. Your body responds to stressors differently depending on whether the stressor is new or short term â acute stress â or whether the stressor has been around for a longer time â chronic stress.