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.
by: MichelleM. Vitamin D (D3) supplements without any doubt make my skin extremely itchy. I have tried a couple different brands of D3 supplements with different fillers over the last few years and the latest one I used is supposed to be one of the top quality ones. All of them that I've tried so far cause this allergic reaction.