Think of a muddy surface drying and cracking in the sun.

Sewage and drainpipes fed directly on to the muddy surface.

The filly covered the 440-yard distance over a muddy surface in 21.44 seconds.

Those cracks along the ancient floor accounted for the muddy surface.

Participants in field sports should know how to adapt to wet or muddy surfaces.

By now plenty of players who regarded grass as an alien and often muddy surface here have become quite familiar with it.

The rain was heavy now, falling in sheets, blowing across the muddy surface of the field.

Trent held his breath, face under the muddy surface of the river.

Passage was not difficult, for the road was solid beneath the muddy surface.

Sometimes people slipped on the muddy surface, and fell into the holes.