The cracking of rock due to heat is an example of . a.
erosion
b.
physical weathering
c.
chemical weathering
d.
none of the above

B. physical weathering

Explanation: I can confirm the first person who answered! This answer is correct on edge2020 :)

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.

d we did this already