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20 man-made things are :
1)car, 2)house, 3)pens, 4) bags, 5)chair, 6) table, 7) atom bomb, 8)cooler , 9) AC, 10) Fan, 11) cupboard, 12)wheel, 13) helicopter, 14) aeroplane, 15) bridge, 16) tower, 17) clothes, 18) paper, 19) eraser, 20) fridge.
5 natural changes
1) growth in man, 2) seasonal changes, 3) land degradation, 4) volcano eruption, 5) Hurricanes
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