Physics
The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with

Archimedes' principle
Pascal's law
Newton's law
Bernoulli's principle

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Physics
The blue colour of water in the sea is due to

Scattering of blue light by water molecules
Absorption of other colours except blue by water molecules
Reflection of blue sky by sea water
Reflection of blue light by impurities in sea water

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