The reason is that darknessâor, to put it the other way, the absence of lightâstimulates the production of a hormone, melatonin, from its immediate precursor, the neurotransmitter serotonin. Like serotonin, melatonin plays important roles in our physical and mental well-being.
The five major ocean gyres. A gyre in oceanography is any large system of circulating ocean currents, particularly those involved with large wind movements. Gyres are caused by the Coriolis effect; planetary vorticity along with horizontal and vertical friction, determine the circulation patterns from the wind curl (torque).
The troposphere is the most interesting layer of the atmosphere. It is below the stratosphere. Weather happens in the troposphere. That is because the troposphere is the only layer that has enough water vapor to have clouds, which drop rain and snow.Some planes fly near the top of the troposphere.The troposphere is the most chaotic layer of the atmosphere; it is also the only one that can support life.eather happens in the troposphere. That is because the troposphere is the only layer that has enough water vapor to have clouds, which drop rain and snow. Some planes fly near the top of the troposphere. The troposphere is the most chaotic layer of the atmosphere; it is also the only one that can support life.