https://www.khanacademy.org/science/karnataka-bridge-course-class-7th-science/x23f4b0ee108f5758:water/x23f4b0ee108f5758:properties-of-water/e/need-utility-and-sources-of-water 2025-08-05T08:33:57.588913915Z Need, utility and sources of water LO1: Need and utility of water. LO2: sources of water Revathi exercise https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:pollution/x0f256b8de9c7cf34:water-pollution/e/pollution-and-conservation-of-water 2024-06-16T13:03:12.23291439Z Pollution and conservation of water Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/up-science-grade-6-revision-course-full-term/x017c12e57b64cfa8:week-4/x017c12e57b64cfa8:untitled-260/e/water-purification 2025-08-05T08:33:57.588913915Z Water purification LO: Impurities in water and water purification. Revathi exercise