https://www.khanacademy.org/science/revision-up-science-class-6-full-term/x00110b31861f2508:week-4/x00110b31861f2508:nature-s-treasures/v/water 2025-01-27T07:04:21.433023569Z Water Water scarcity is a major problem faced by over 2 Billion people across the globe. But why does this happen when 70% of the Earth's surface is made up of water? How can we help save water? Joel Prakash Stephen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Water Water scarcity is a major problem faced by over 2 Billion people across the globe. But why does this happen when 70% of the Earth's surface is made up of water? How can we help save water? https://cdn.kastatic.org/ka-youtube-converted/Dozbgnftdao.mp4/Dozbgnftdao.mp4 254 Water resource management and conservation https://www.khanacademy.org/science/biology/ecology/biogeochemical-cycles/v/the-water-cycle 2024-05-06T19:22:43.24334365Z The water cycle The water cycle, powered by the sun, involves water moving in various forms between sources and sinks. It starts with evaporation from bodies of water, condensation into clouds, and precipitation back to the earth. This cycle also includes transpiration from plants and sublimation from ice to vapor. The majority of Earth's water is saltwater, with only a small percentage being freshwater in lakes, rivers, and groundwater. Sal Khan video https://cdn.kastatic.org/googleusercontent/okxRKXMHovcsPlENtDy06lBLXXn7tUYfX5eG7MOD5nZYSr_KyM9ufnRznemT6SbIP9tt1CNOA0D36g4_qHKE9eE The water cycle The water cycle, powered by the sun, involves water moving in various forms between sources and sinks. It starts with evaporation from bodies of water, condensation into clouds, and precipitation back to the earth. This cycle also includes transpiration from plants and sublimation from ice to vapor. The majority of Earth's water is saltwater, with only a small percentage being freshwater in lakes, rivers, and groundwater. https://cdn.kastatic.org/ka-youtube-converted/jFjI6y46QRk.mp4/jFjI6y46QRk.mp4 494 Water resource management and conservation https://www.khanacademy.org/science/middle-school-earth-and-space-science/x87d03b443efbea0a:weather-and-climate/x87d03b443efbea0a:the-water-cycle/e/understand-the-water-cycle 2026-04-28T11:00:37.315336883Z Understand: The water cycle Check your understanding of the water cycle in this set of free practice questions aligned to NGSS standards. Lauren Rosebrugh exercise https://www.khanacademy.org/science/strengthened-shs-earth-and-space-science-2/x21bb710e6de17395:earth-s-surface-systems/x21bb710e6de17395:dynamics-of-hydrologic-cycle/e/groundwater-as-an-important-source-of-water 2026-05-04T07:20:44.00495003Z Groundwater as an important source of water Class 7 Science Exercise on Groundwater | NCERT Chapter 16 | Water Table, Depletion, Recharge, Tube Wells, Real-Life Applications | Conceptual Practice Questions Yajurva Joshi exercise https://www.khanacademy.org/science/class-7-science/x0c8b40bd4b242f0b:water/x0c8b40bd4b242f0b:hardness-and-softness-of-water/e/conserving-water 2026-03-06T17:50:38.494926415Z Conserving water Let's do some questions! vibhor exercise