Explaining The Universe on Instagram: "All of Earth’s water, known as the hydrosphere, covers about 71% of the planet’s surface and exists in many forms — oceans, lakes, rivers, ice, groundwater, and even water vapor in the atmosphere. About 97% of it is salt water found in the oceans, while only about 3% is fresh water. Most of that fresh water is locked in glaciers and ice caps, mainly in Antarctica and Greenland. Less than 1% of Earth’s total water is available as liquid fresh water in rivers