Physics
Magnetism in materials is due to

Electrons at rest
Circular motion of electrons
All neutrons at rest
Protons at rest

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Physics
Why does the sea appear blue in colour?

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

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Physics
Thermohaline circulation is mainly due to

Cold, dense ocean water sinking and warmer water replacing it
Warm water being added to the ocean due to industial waste
Warmer, less dense water sinking in the ocean and cold water replacing it
Winds causing circulation of ocean water

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