``Water is dew. Water is ice and snow.'' No matter what form it takes, seldom has plain old water appeared so colorful as in this rainbow-hued look at rain, dew, snowflakes, clouds, rivers, floods, and seas. Asch celebrates water's many forms with a succinct text and lush paintings done in mostly in softly muted watercolors of aqua, green, rose, blue, and yellow. They look as if they were created with a wet-on-wet technique that makes every hue lightly bleed into its neighbor. Water appears as ribbons of color, one sliding into the other, while objects that are not (in readers' minds) specifically water-like—trees, rocks, roots—are similarly colored. Perhaps the author intends to show water is everything and everything is water, but the concept is not fully realized for this age group. The whole is charming, but more successful as art than science. Though catalogued as nonfiction, this title will be better off in the picture book section. (Picture book/nonfiction. 5-7)