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.
Healthy Skin: Biotin plays a major role in improving skin health and deficiency of this B-complex vitamin can lead to a wide range of skin problems like pimples, acne, itching, inflammations, rashes, psoriasis and dermatitis. Biotin in combination with vitamin E helps in improving skin health.