How do minute rock particles become pollutants in the atmosphere?

Rock particles can become pollutants by/from the wind. That is called erosion.

They can also become pollutants from man-made tools. For example a tool the polishes rocks releases all the dust and powder substance from the rock into the atmosphere.

There are also minute volcanic which are rock fragments formed during explosive shattering of sticky magma.

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.