Match the sedimentary rock with its metamorphic equivalent. 1. slate a; sandstone b; shale c; limestone d; coal 2. graphite a; sandstone b; shale c; limestone d; coal

the answer is c.) there is a warm front in region a and a stationary front in region b.

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.