How does the dermis function in thermoregulation?

The dermis helps maintain body temperature and contains the swear glands which may open up when the body is overheating and close when the body is too cold.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.