The ozone layer
is found in the upper part of the thermosphere
absorbs much of the sun's harmful UV radiation
keeps the stratosphere very cold
is made of charged ions and free electrons

absorbs much of the sun's harmful UV radiation

Explanation:

The ozone layer consists richly of ozone molecules. Ozone with the chemical formula O3, is an allotrope of oxygen found in the atmosphere and helps to absorbs much of the ultraviolet radiation of the sun, preventing it from reaching the earth

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.