It explains how the river becomes polluted and what steps must be taken to rescue it. The impact of man's activities on a river is the subject of this chapter. CBSE Class 4 EVS Chapter 1 Revision NotesĬBSE Class 4 EVS Chapter 15 Revision NotesĬBSE Class 4 EVS Chapter 2 Revision NotesĬBSE Class 4 EVS Chapter 16 Revision NotesĬBSE Class 4 EVS Chapter 3 Revision NotesĬBSE Class 4 EVS Chapter 17 Revision NotesĬBSE Class 4 EVS Chapter 4 Revision NotesĬBSE Class 4 EVS Chapter 18 Revision NotesĬBSE Class 4 EVS Chapter 5 Revision NotesĬBSE Class 4 EVS Chapter 19 Revision NotesĬBSE Class 4 EVS Chapter 6 Revision NotesĬBSE Class 4 EVS Chapter 20 Revision NotesĬBSE Class 4 EVS Chapter 7 Revision NotesĬBSE Class 4 EVS Chapter 21 Revision NotesĬBSE Class 4 EVS Chapter 8 Revision NotesĬBSE Class 4 EVS Chapter 22 Revision NotesĬBSE Class 4 EVS Chapter 9 Revision NotesĬBSE Class 4 EVS Chapter 23 Revision NotesĬBSE Class 4 EVS Chapter 10 Revision NotesĬBSE Class 4 EVS Chapter 24 Revision NotesĬBSE Class 4 EVS Chapter 11 Revision NotesĬBSE Class 4 EVS Chapter 25 Revision NotesĬBSE Class 4 EVS Chapter 12 Revision NotesĬBSE Class 4 EVS Chapter 26 Revision NotesĬBSE Class 4 EVS Chapter 13 Revision NotesĬBSE Class 4 EVS Chapter 27 Revision NotesĬBSE Class 4 EVS Chapter 14 Revision Notes
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