Physics
Radioactive elements can be traced out in living cell through a technique called

Auto radiography
Centrifugation
Chromatography
All listed here

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Physics
Thermohaline circulation is mainly due to

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

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

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

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