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 lowest part of the atmosphere of the Earth. It is shallower near the polar regions and is denser in the tropics. Observable day-to-day weather phenomenoâ¦n occur here. The temperature of the troposphere decreases with increase in height and hence water vapour content decreases with height. An imaginary line at the boundary of the troposphere and the stratosphere is known as tropopause. The troposphere constitutes 80% of the total mass of the atmosphere and almost all of the water vapour and atmospheric particulate matter are concentrated in this layer.