Physics
The absorption of ink by blotting paper involves:

Viscosity of ink
Capillary action phenomenon
Diffusion of ink through the blotting
Siphon action

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Physics
Radiocarbon is produced in the atmosphere as a result of

Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Lightning discharge in atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.

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