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SAI INTERNATIONAL SCHOOL


                                                    CLASS -IV-SCIENCE


                                                        Chapter 13- Our Environment

                                                         Sub Topic- Land Pollution






                                                      Chemicals








                                      House             Land               Farm
                                       hold
                                     wastes           Pollution           wastes








                                                        Animal
                                                        wastes




               Notes:

               The mixing of harmful substances in the soil is known as land pollution.
                       1. Chemicals- Farmers use chemicals to improve the growth of
                       plants and to kill insects and unwanted plants. When these
                       chemicals mix with the soil they lower the quality of the soil.
                       2. Farm Wastes - Farm wastes such as plant parts also pollute soil.
                       3. House hold wastes - Throwing house hold wastes such as cans,
                       bottles and plastic bags, pollute the land.
                       4. Animal Wastes - These wastes makes the land dirty.
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