Immerse your students in Earth's most abundant resource--water. Embark on a voyage of discovery as you steer your students through activities designed to teach them about currents, waves, and tides. From an understanding of the properties that make water unique, your students will get a global view of the marine environment, including the impact of human activities on the oceans. This book is one of four in NSTA's popular Project Earth Science series. The other books are Project Earth Science: Geology, Project Earth Science: Astronomy, and Project Earth Science: Meteorology.