High tide, low tide . what happens when the tides flow? An award-winning nonfiction author offers the youngest explorers a closer look at nature's wonders in action. When ocean waters face the moon, waves move toward the sandy dunes and salty water floods the beach. Driftwood bobs on top of waves and fish swim freely below. But what happens when the water retreats and the tide is low? Step by step, Sally M. Walker's simple narration lets the youngest oceanographers follow changes to the shoreline as the tide goes in and out. Kim Smith's art captures the waves in motion, the treasures deposited on the beach, and the living things nearby, from shorebirds to sea plants, from crabs and sea stars to children happily exploring the shore. A note to parents suggests bringing the learning to life by encouraging questions and observations of the natural world.