A small pool of water in the rocks near the ocean's edge might not seem like an interesting place. But tide pools are natural aquariums, and there's plenty to explore. This informative leveled reader explains what causes the tides, how tide pools form, and which amazing creatures have adapted to life in these constantly changing environments.A small pool of water in the rocks near the ocean's edge might not seem like an interesting place. But tide pools are natural aquariums, and there's plenty to explore. This informative leveled reader explains what causes the tides, how tide pools form, and which amazing creatures have adapted to life in these constantly changing environments.