The outside layer of something that is baked is called the crust. Some people don’t like the crust because it’s hard, but for others, it’s their favorite part of the food:
The topmost layer of a rocky planet is called the crust. The crust of the Earth is over four billion years old. The moon also has a crust.
Some things become hard on the surface with the passage of time. These things are said to be "crusty."
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Published on December 26, 2012.