crust

1. The outermost solid layer of the earth, mostly consisting of crystalline rock and extending no more than a few miles from the surface to the MohoroviSc discontinuity. Also known as earth crust. 2. A hard layer of snow lying on top of a soft layer.

Related terms:

• ice crust
• sun crust
• rain crust
• wind crust
• foam crust
• perforated crust
• spring crust
• snow crust
• earth crust
• continental crust