Sinkholes are formed by the actions of acid rain plant roots ocean water groundwater

Sinkholes form when groundwater breaks down limestone causing the earth to cave in often forming a pond or body of water as the underground stream and rain continues to fill the hole

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.