We can answer all your questions so that you have the healthiest humidity level in your home, office or classroom that will help ease your allergy and asthma symptoms. When the humidity level is too high, it can cause problems and the same can be said about a low humidity level.
What the earth layers are: RED â inner core ORANGE â outer core YELLOW â mantle BLACK â crust BLUE AND GREEN â land and water.
These are its main layers, starting with the outermost: 1  crust - relatively thin and rocky. 2  mantle - has the properties of a solid, but can flow very slowly. 3  outer core - made from liquid nickel and iron. 4  inner core - made from solid nickel and iron.