The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers. The crust is only about 3-5 miles (8 kilometers) thick under the oceans(oceanic crust) and about 25 miles (32 kilometers) thick under the continents (continental crust).
The problem behind your itchy skin might be insufficient vitamin intake. There are a number of vitamins that promote the hydration and healthiness of your skin. A shortage in these could trigger itchiness, dry skin and other skin conditions. Alternatively, an overdose of such vitamins might also lead to itchy skin.
the immune system can be compromised by a vitamin a deficiency vitamin a has been used to treat children with measles that have a vitamin a deficiency supplementing their diet with vitamin a has been found to shorten the duration and severity of the illness side effects to watch for include diarrhea and pneumonia