A thick layer of salt is added to the top.

From the thick layer of dust on everything, he knew no one had been back here in many years.

A thick layer of ice remained between him and us.

Its light covered everything as with a thick layer of white paint.

It is however covered by a thick layer of ice.

They also have a thick layer of fat which helps keep them warm.

Lay it on in thick layers over a few square feet at a time.

He and the others were all covered with a thick layer of dirt.

So, the floor in the living room was covered with a rather thick layer of very fine brown powder.

Relatively likely to build up a thick soft layer and keep it.