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.
Can Vitamin D Cause Itchy Skin. Every since I have been taking Vitamin D my whole body has been prone to very itchy skin, which I might add, is very annoying. Every day different areas begin to itch for no reason at all. Again this has been happening just since I have started using Vitamin D..