crust

The crust cracked, the oil and salt rose.

The spots fill up with fluid and become blisters before crusting over to form scabs, which eventually drop off and clear up.

I mentioned the pie crust because when you have your hands in something, you’re focused on that.

Hydrogen sulfide and methane seep out of faults - or cracks - in the Earth's crust.

Some people may be tempted to see online renewal as just another service tailor-made for the upper crust, because who else needs a passport for foreign travel?