Physics
Solids have definite shapes.This is because

The forces of cohesion are very large
The forces of adhesion are less
The forces of adhesion are large
The forces of cohesion of the molecules within are very much less in them

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Physics
Mirage is due to:

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

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