Question
Rainwater harvesting has become important these days.
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Answer
Rainwater harvesting has become important these days to conserve water. Water supply in urban area is getting short against the demand. Rainwater is collected and stored for use when water is scarce. Groundwater is getting depleted. Rainwater harvesting replenishes groundwater. It is also a good substitute to polluted water as rain in the purest form of natural water.
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Solve this crossword by using the clues that follow-
Across
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Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
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Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
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2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
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