For example, the wind easily produces ripples on the surface of a pond.

If the free surface of a liquid is disturbed, waves are produced on the surface.

In mass, the spores (produced on the surface of the branches) are white.

So often an aerial search produced visual clues not apparent on the surface.

Percussion instruments produce sound through striking on the surface.

Ovules are produced on the adaxial surface of the cone scales.

In most instances, a kink will produce a slight burr on the surface which can be smoothed out.

Antimatter is being produced on the surface of the sun during flares.

Spores are produced by basidia on the outer surface of the branches.

The first attack on the U-boat produced some oil on the surface.