Physics
When hot liquid is poured into a thick glass tumbler, it cracks because glass :

Has a very low specific heat
Is a bad conductor of heat so only inner surface expands
Has high temperature coefficient of expansion
Has low temperature coefficient of expansion

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Physics
Mirage is due to:

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

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