Natural light- sun light.
Artificial light- torch light..
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salt water = sodium chloride + water
urine = water + urea + salts containing sodium, potassium, and chlorine
crude oil, sea water, urine
Torch light is NOT a natural source of light. It is an Artificial Source of light generated by the electrical energy. In this the electrical energy is being transformed into Light energy.
No. A light bulb is.
Uranium is not artificial radioactivity so it is not clear what the question is about.
Artificial light.
Yes.