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What is Water Pollution? What is water pollution? Water pollution occurs when harmful substances—often chemicals or microorganisms—contami...
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Flooding sometimes be a problem in various cities, flooding is usually happened during the rainy season, the cause of the flood is very di... -
1. Mercury 2.Venus 3. Earth 4. Mars 5. Jupiter 6. Saturn 7. Uranus 8. Neptunus
