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.
1 When vitamin B12 is taken at normal doses, side-effects are rare. 2  High doses may cause acne. 3  Allergies to vitamin B12 supplements have been reported and can cause swelling, itchy skin and shock.4  Interactions. 5  Drugs for acid reflux, diabetes and other conditions may make it harder for your body to absorb vitamin B12. When vitamin B12 is taken at normal doses, side-effects are rare. 2  High doses may cause acne. 3  Allergies to vitamin B12 supplements have been reported and can cause swelling, itchy skin and shock.