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

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

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Physics
Analog synthesis refers to a technology based on

Representing physical quantities as numbers.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.
Interfacing synthesizer equipment.
Representing data in terms of measurable physical quantities.

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