Physics
Mirage is due to:

Depletion of ozone layer in the atmosphere
Unequal heating of different parts of the atmosphere
Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is less than that between concrete and feet.
the sand is grainy but concrete is smooth.
the friction between sand and feet is more than that between concrete and feet.
sand is soft and concreter is hard.

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