Water Water is all around us. 70% of Earth is water. It impacts fisheries, water cycles, weather, and shipping routes. Learn about our freshwaters and oceans.FRESHWATEROCEANS Freshwater Freshwater | Water Science What is the Hydrologic Cycle? 3 Steps of the Water Cycle The hydrologic cycle describes how water moves continuously in nature. From evaporation, condensation and surface runoff – water is always in motion. Why Watersheds Are Like Upside-Down UmbrellasA Guide to Groundwater: Earth’s Hidden Freshwater SupplyStates of Water: Gas, Liquid and SolidHow Does Eutrophication Work? Causes, Process and ExamplesRiver Delta: How It Forms Oceans Ocean Salinity: How Much Salt is in Oceans?Coral Reef Facts: Ocean Biodiversity HotspotsOcean Exploration: 20% Explored, 80% UnexploredHow Much Water Is on Earth?Did Earth’s First Water Come from Comets, Volcanoes or Asteroids?What Causes Ocean Tides? Oceans | Water Science What Causes Tsunamis? A Guide to How Tsunamis Form Tsunamis are long, tall waves that can be disastrous to anything nearby. But what causes tsunamis? 80% start from earthquakes. And how do tsunamis form?How Much Will Sea Level Rise?What are the 5 Oceans of the World?