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 Vitamin Deficiency: The deficiency of vitamin in the body may also cause itchy lips. 2  The deficiency of vitamin B12 in the body causes Cheilitis, which results in redness and itchiness of the lips. 3  Vitamin A Toxicity: The overdose of vitamin A or chronic vitamin A toxicity also leads to itchy and cracking lips.