The yellow is the region where fluid flow from the Earth's outer core is the greatest. Red mush is the inner core boundary. Large flows exist on an imaginary tangent cylinder due to the effects of the Earth's rotations, fluid viscosity and the presence of the solid inner core within the spherical shell of the outer fluid core.
Growth Rates. Fingernails grow approximately 2 to 3 millimeters, or about 1/8 inch, per month. Toenails grow slower than fingernails, at a rate of about 1 mm per month. Hair, on the other hand, grows at a much faster rate: roughly Â¼ to Â½ inch per month, or 6 inches per year. In fact, after bone marrow, hair is the fastest growing tissue in the body.
Why do toenails thicken as we age but fingernails donât? A. With age, there is a rapid decrease in the growth rate for both toenails and fingernails, said Dr. Richard K. Scher, head of the nail section at Weill Cornell Medical College. As a result, both kinds of nail thicken, because of the piling up of nail cells, called onychocytes. Fingernails do not thicken as much, however, because the decrease in their rate of growth is much smaller. And fingernails tend to be filed and buffed much more, which thins them. Other factors that can affect the rate of thickening include long-term trauma and impaired circulation.