In addition, sores and cracks may occur spontaneously.

When a crack occurs in a hard layer, it is absorbed by the soft layer and does not spread.

No one is sure why the cracks occurred.

But the crack epidemic occurred under the most aggressively enforced "prohibition" in history.

The cracks are intergranular, and occur at grain boundaries.

When a crack occurs, nearby capsules break and release the chemicals, which flow into the crack.

When a crack occurs, the healing chemicals flow by capillary action to the crack.

Similar cracks had occurred in the X2 trains, but after many years of operations.

Infected trees become very brittle, and cracks can occur in the affected tree due to wind.

The Ashland statement said there were no X-rays of the area where the crack occurred.