https://www.khanacademy.org/science/class-7-science/x0c8b40bd4b242f0b:air/x0c8b40bd4b242f0b:air-pollution/e/air-pollution-middle-school-india 2026-04-07T23:55:07.30621384Z Air Pollution An exercise dealing with the causes and remedies of air pollution. Joel Prakash Stephen 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/od-class-6-science-bridge-course/x2aff4c1317c56c62:waste-disposal/x2aff4c1317c56c62:untitled-77/v/solid-waste-disposal-in 2025-05-24T05:46:47.091500703Z Solid waste disposal Let's learn how solid waste is disposed! Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Solid waste disposal Let's learn how solid waste is disposed! https://cdn.kastatic.org/ka-youtube-converted/q2xiutLOl1k.mp4/q2xiutLOl1k.mp4 476 Types of pollution https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:pollution/x0f256b8de9c7cf34:soil-pollution/e/soil-pollution 2026-04-07T23:17:37.123726494Z Soil Pollution Causes and prevention of soil pollution. Joel Prakash Stephen exercise