Question

Describe. How ozone layer is formed?

Answer 1

Explanation:

Stratospheric ozone is formed naturally by chemical reactions involving solar ultraviolet radiation (sunlight) and oxygen molecules, which make up 21% of the atmosphere. In the first step, solar ultraviolet radiation breaks apart one oxygen molecule (O2) to produce two oxygen atoms (2 O)

Answer 2

Answer:

ospheric ozone. Stratospheric ozone is formed

naturally by chemical reactions involving solar ultraviolet

radiation (sunlight) and oxygen molecules, which make up

21% of the atmosphere. In the first step, solar ultraviolet

radiation breaks apart one oxygen molecule (O2) to produce

two oxygen atoms (2 O) (see Figure Q2-1). In the second step,

each of these highly reactive atoms combines with an oxygen

molecule to produce an ozone molecule (O3). These reactions

occur continually whenever solar ultraviolet radiation is pres-

ent in the stratosphere. As a result, the largest ozone produc-

tion occurs in the tropical stratosphere.

The production of stratospheric ozone is balanced by its

destruction in chemical reactions. Ozone reacts continu-

ally with sunlight and a wide variety of natural and human-

produced chemicals in the stratosphere. In each reaction, an

ozone molecule is lost and other chemical compounds are

produced. Important reactive gases that destroy ozone are

hydrogen and nitrogen oxides and those containing chlorine

and bromine (see Q8).

Some stratospheric ozone is regularly transported down

into the troposphere and can occasionally influence ozone

amounts at Earth’s surface, particularly in remote, unpolluted

regions of the globe.

Tropospheric ozone. Near Earth’s surface, ozone is

produced by chemical reactions involving naturally occur-

ring gases and gases from pollution sources. Ozone produc-

tion reactions primarily involve hydrocarbon and nitrogen

oxide gases, as well as ozone itself, and all require sunlight

for completion. Fossil fuel combustion is a primary source

of pollutant gases that lead to tropospheric ozone produc-

tion. The production of ozone near the surface does not sig-

nificantly contribute to the abundance of stratospheric ozone.

The amount of surface ozone is too small in comparison and

the transport of surface air to the stratosphere is not effec-

tive enough. As in the stratosphere, ozone in the troposphere

is destroyed by naturally occurring chemical reactions and

by reactions involving human-produced chemicals. Tropo-

spheric ozone can also be destroyed when ozone reacts with a

Ozone is formed throughout the atmosphere in multistep chemical processes that require sunlight. In the stratosphere,

the process begins with an oxygen molecule (O2 ) being broken apart by ultraviolet radiation from the Sun. In the lower

atmosphere (troposphere), ozone is formed by a different set of chemical reactions that involve naturally occurring gases and and those from pollution sources