Physics
Which of the following laws validates the statement that matter can neither be created nor destroyed ?

Le Chatelier's Principle
Law of osmosis
Law of conservation of mass
Law of conservation of energy

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Physics
Why does the sea appear blue in colour?

Interference of the sun light from water surface
Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Refraction of the sun light

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