Physics
The law of conservation of energy states that

Energy can either be created nor destroyed
Energy can neither be created nor destroyed
Energy can neither be created or destroyed
Energy can either be created or destroyed

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of mercury is greater than its adhesion with glass.
cohesion of water is greater than its adhesion with glass.
mercury is a metal.
density of mercury is greater than that of water.

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