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

There is more friction between the ice and feer
None of these
There is very little friction between the ice and feet pressing it
Ice is soft when compared to concrete

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Physics
Mirage is due to:

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

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