Nick Adams was a rebel. âJohnny Yuma was a rebel. He roamed through the West.â. Those words were sung over the credits of The Rebel, a half-hour western drama from the early 1960s that is probably familiar to most baby boomers.
From Wikipedia, the free encyclopedia. A thermocline (sometimes metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake, or air, such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below.
Understanding Lakes. A typical lake has distinct zones of biological communities linked to the physical structure of the lake (Figure 10). The littoral zone is the near shore area where sunlight penetrates all the way to the sediment and allows aquatic plants (macrophytes) to grow. Light levels of about 1% or less of surface values usually define this depth. The 1% light level also defines the euphotic zone of the lake, which is the layer from the surface down to the depth where light levels become too low for photosynthesizers.