Walk as fast as you can in a circle around a section of the pool that's about 3 feet deep (the more people, the better the effect). Do about 20 laps, then change direction for 10 laps. The resulting rush of water against your body will feel much like the jets in a whirlpool.
Elements and Compounds. All matter in the natural world is composed of one or more of the 92 fundamental substances called elements. An element is a pure substance that is distinguished from all other matter by the fact that it cannot be created or broken down by ordinary chemical means.
building block; unit. Context example: units of nucleic acids. Hypernyms (building block is a kind of...): thing (a separate and self-contained entity) Meronyms (parts of building block): part; piece (a portion of a natural object) Hyponyms (each of the following is a kind of building block): chain; chemical chain ((chemistry) a series of linked atoms (generally in an organic molecule))