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प्रश्न
Wells are fed by
विकल्प
pond water.
lake water
rain water.
ground water.
उत्तर
ground water.
Explanation:
Some of this water is absorbed by the ground and soil, increasing the level of groundwater. This groundwater becomes the well's source of water.
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| (d) substance causing temporary hardness | (4) washing soda |
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