Ultraviolet light (UV light) is an electromagnetic radiation with a wavelength longer than that of x-rays, but shorter than that of visible light.
Ultraviolet light can break some chemical bonds and cause cell damage.
A substantial break or gap in a stratigraphic sequence that marks the absence of part of the rock record.
Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
The concept that the processes that have shaped Earth in the geologic past are essentially the same as those operating today.
Reference:Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
Air that flows toward higher terrain, and hence is forced to rise. The added lift often results in widespread low cloudiness and stratiform precipitation if the air is stable, or an increased chance of thunderstorm development if the air is unstable.