1. Does radiation occur naturally on earth?

The majority of background radiation occurs naturally and a small fraction comes from man-made elements. is present on Earth at all times. The majority of background radiation occurs naturally from minerals and a small fraction comes from man-made elements.

Explanation:

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explanation:

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.