Chemistry
Water cycle refers to

Constant movement of water from ocean to land and back to ocean once again
Scientific management of water in areas excessively plagued with water-logging
Water distribution in relatively dry areas
An integrated attempt to recycle water in relatively arid regions

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Chemistry
All isotopes of the same element have ________

Different atomic numbers and different atomic mass
The same atomic number and the atomic mass
Different atomic numbers and the same atomic mass
The same atomic number but different atomic masses

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Chemistry
Water is not effective in extinguishing a fire caused by petrol because

Water and petrol are miscible with each other
Water and petrol react chemically
Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn
The flame is too hot for water to cool it down

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