Physical agents of cancer:
- ionizing radiations
- u.v radiations
- mineral fibers
The above mentioned factors are naturally occurring but they are even released/generated human activities.
Asbestos is a naturally occurring mineral fiber, but its a human enhanced physical carcinogenic agent. The reason for this is that though it is occurring naturally we are getting exposed to it thru mining activities and thru commercial products. (It is a naturally occuring mineral but exposure to it is not a natural one. we humans are responsible for that)
Low frequency electric,magnetic fields, hyperthermia are also considered to be associated with carcinogenesis.
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