Water ripples spread.

Meaning: This sentence describes the natural effect of ducks swimming in the water, which is to create ripples that move outward.

Choice of Words: Water is the medium in which ducks swim. Ripples are small waves that are created when something disturbs the surface of the water. Spread is a verb that means to move outward from a central point. So, "Water ripples spread" means that the small waves created by the ducks' movements are moving outward from where they were created.

Alternative Expressions

Water ripples move.

Meaning: This means that the small waves on the water move from one place to another.

Choice of Words: Water is a noun referring to the liquid substance found in lakes, rivers, oceans, etc. Ripples are small waves that move across the surface of water, like when you throw a stone into a pond. Move means to change position or location. When you put them together, "Water ripples move" means that the ripples on the water's surface move from one place to another.

Related Expressions