1.   A hard gray crust had formed on the bottom of the tea kettle.

2.   The lake is flat, its hard crust free of fresh snow.

3.   He slurped as noisily as a ravenous dog, mopping up what was left with hard crusts of bread which Father Peter shoved before him on a wooden platter.

4.   A brioche made without salt will be tough and dense with a hard crust.

5.   Use a sturdy roll with a hard crust for this panino, as the juice from the chicken salad will permeate the bread.

6.   When planting, this two-sided hand tool can be invaluable when trying to penetrate the hard crust of clay soil.

7.   The lava formed a hard crust Sunday, and Goma residents were running across the top of it to cross the city.