The surface energies of the two materials are significantly different.

I saw a flock of surf scoters flying over the ocean.

Surf carnivals are popular events held at the beach.

The surface layers of the soil contain a high concentration of nutrients.

The surface ships patrolled the coastline.

The surf-riders caught some big waves at the beach.

The surf rockers performed an energetic set at the beach party.

I saw a flock of surf ducks at the beach.

He surf-casted his fishing line into the ocean.

The surf-casters lined up along the beach, casting their lines into the ocean.