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 Dermatitis (inflamed skin): related to deficiency in Vitamins B2, B3, B6, C, E, A, zinc, and biotin. 2  Follicular Hyperkeratosis (plugged pores on the backs of the arms): Vitamin A deficiency. 3  Seborrheic Dermatitis (flaky, oily skin): could be a biotin deficiency. 4  Eczema: potentially Vitamin B2 or Vitamin E deficiency. nutrient is a catch-all term for any substance that provides the building blocks for replenishment of an organism (so it includes vitamins, minerals, essential fatty acids, essential amino acids, and also macronutrients, such as carbs, protein, and fats).