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 Umbrellas A Guide to Groundwater: Earth’s Hidden Freshwater Supply States of Water: Gas, Liquid and Solid How Does Eutrophication Work? Causes, Process and Examples River Delta: How It Forms Oceans Ocean Salinity: How Much Salt is in Oceans? Coral Reef Facts: Ocean Biodiversity Hotspots Ocean Exploration: 20% Explored, 80% Unexplored How 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?