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.
Patients who live in northern climates that get less sun actually have a higher prevalence of the condition. Conditions that can cause itchy skin, such as psoriasis, may be treated or even prevented with vitamin D, according to Consumer Reports. Psoriasis is a common problem that causes cells to accumulate on the surface of the skin quickly. Characteristics of this disease are a scaly appearance and itchy, dry patches.