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

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

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Physics
Analog synthesis refers to a technology based on

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

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