The moving of snow crystals on frozen crust.

They waded into it, their feet breaking through the frozen crust at every step.

His knee crunched through the frozen crust as he knelt in the snow just beyond the cameras' view.

Her mother was frozen down there, somewhere, lost within the thick frozen crust.

Unfortunately the snow, which had looked sun-softened from the top, actually had a heavy frozen crust on it.

Go to the freezer section & get one of those frozen crusts.

The first attempt was foiled by a frozen crust above the target; Melnyk succeeded on the third try.

In their caps and mittens they had skittered along the frozen crust that covered the lawn.

Overhead, the reinforced bridge crashed through the frozen crust, shuddering the boat.

There was a hard frozen crust at the top, despite the concrete covering.