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.
Okay, the lack of B12 vitamin, or Riboflavin, is also a cause of dry, itchy, red, chapped lips so I am now taking one a day teen advantage and that has 153% of the daily value of b12. I hope these work!!!(fingers crossed) so I've got my water bottle handy and my daily pills on the counter.