Ozone Layer and How it is Getting depleted

The earth’s atmosphere is made up of several layers. The troposphere is the lowest part of the earth’s atmosphere that extends from the earth’s surface up to 10km in altitude. All human activities occur in the troposphere. The next layer is the stratosphere which continues from 10km to about 50km. Ozone is concentrated in a layer in the stratosphere from 15 to 30 km above the earth’s surface. The ozone layer in the stratosphere, absorbs the portion of the radiation from the Sun, preventing it from reaching the surface of Earth.

When sunlight reaches the stratosphere, the ultraviolet rays of sunlight split up oxygen molecule(O2) into its two atoms. The high reactivity of the oxygen atom forces it to combine with oxygen molecules resulting in the formation of ozone molecules.

O2 → O + O

O2+ O→ O3

Ozone(O3) is a molecule formed by three atoms of oxygen. While O2.which we normally refer to as oxygen, is essential for all aerobic forms of life.Ozone performs an essential function. It shields the surface of the earth from ultraviolet(UV) radiation from the Sun. This radiation is highly damaging to organisms, for example,it is known to cause skin cancer and cataract in human beings, UV rays also has its harmful effects on plant life and marine life.

Food chain and food web in an ecosystem

Class 10 Biology Viva Voce Questions and Answers for CBSE Board 2020-21

Class 10 Physics Viva Voce Questions and Answers

Class 10 chemistry Viva Voce Questions and Answers for CBSE Board 2020-21

Ozone at the higher levels of the atmosphere is a product of UV radiation acting on oxygen (O2) molecules.The higher energy UV radiations split apart some molecular oxygen (O2) into free oxygen (O) atoms. These atoms then combine with the molecular oxygen to form ozone as shown –

Depletion of Ozone Layer

The ozone molecule is destroyed when it comes with the contact of a chlorine atom, one chlorine atom can destroy 100000 ozone molecules. It occurs when compounds containing chlorine are exposed to ultraviolet rays the compounds which release chlorine or similar elements like bromine are responsible for the depletion of ozone layers. The amount of ozone in the atmosphere began to drop sharply in the 1980s. This decrease has been linked to synthetic chemicals like chlorofluorocarbons (CFCs) which are used as refrigerants and in fire extinguishers, such compounds which causes depletion of the ozone layer are known as Ozone Depletion Substance(ODS), the other ODS are Hydrochlorofluorocarbon(HDFCs), Carbon tetrachloride and Methyl chloroform which releases chlorine, the ODS which releases bromine are Halons and Methyl bromide. in 1987, the United Nations Environment Programme (UNEP) succeeded in forging an agreement to freeze CFC production at 1986 levels and control the production of other ODS.

Nature contribution in depletion of O3 layer

The volcano’s eruption also affects the ozone layer indirectly. The aerosol produced as a result of volcano eruption when reaches to stratosphere it boosts up the activity of chlorine or bromine atoms although its contribution in depletion of the ozone layer is very less as compared to human-created ODS.

Click for online shopping

Future Study Point.Deal: Cloths, Laptops, Computers, Mobiles, Shoes etc

Ozone Hole

An example of the ozone hole is the Annual ozone ‘hole’ over Antarctica, it is not that ozone is completely absent in that particular region, actually, the amount of ozone is exceptionally low in that region. This happens at the beginning of the southern hemisphere spring (august-October) . The scientist has surveyed that ozone depletion is not limited to the region over the south pole, some of the latitudes over North America, South America, Europe, Asia, and many areas of Africa are also have been seen a decrease in the amount of ozone.

Class 10 Chemistry Practical Based Questions for CBSE 2020-21 Board Exam

Type of Chemical Reactions with Complete detail

Important Science Notes for Class 9 and 10 grade

Class 10 CBSE Science Notes

Myopia, Hypermetropia and Presbyopia

Human eye structure and its function

Electrical resistance and conductance

Electric Current and Heating effect of Electric Current

What is a potential difference across an electric field ?

Why do the star twinkle but planets don’t

Light reflection, refraction, scattering, and dispersion

What is God particle ?

Class 9 CBSE Science Notes

Three Laws of Motion: Class 9 CBSE

Evoporation,Vapourization and Latent heat -Class 9 CBSE notes

What is an atom,molecule and atomicity of a substance?

How to determine Valency,net charge of an ion and Molecular formula of a substance.

Thrust and Pressure : Difference

The Complete Detail of Archimedes Principal

Average Speed and Average Velocity: Differences

How to evaluate recoil velocity of gun

If energy is conserved then why do we need to save it for future generations?

Molar mass,molecular mass and mole concept

What is second law of of motion ?

What is universal law of gravitational force

NCERT Solutions of Science and Maths for Class 9,10,11 and 12

NCERT Solutions for class 9 maths

Chapter 1- Number System	Chapter 9-Areas of parallelogram and triangles
Chapter 2-Polynomial	Chapter 10-Circles
Chapter 3- Coordinate Geometry	Chapter 11-Construction
Chapter 4- Linear equations in two variables	Chapter 12-Heron’s Formula
Chapter 5- Introduction to Euclid’s Geometry	Chapter 13-Surface Areas and Volumes
Chapter 6-Lines and Angles	Chapter 14-Statistics
Chapter 7-Triangles	Chapter 15-Probability
Chapter 8- Quadrilateral

NCERT Solutions for class 9 science

Chapter 1-Matter in our surroundings	Chapter 9- Force and laws of motion
Chapter 2-Is matter around us pure?	Chapter 10- Gravitation
Chapter3- Atoms and Molecules	Chapter 11- Work and Energy
Chapter 4-Structure of the Atom	Chapter 12- Sound
Chapter 5-Fundamental unit of life	Chapter 13-Why do we fall ill ?
Chapter 6- Tissues	Chapter 14- Natural Resources
Chapter 7- Diversity in living organism	Chapter 15-Improvement in food resources
Chapter 8- Motion	Last years question papers & sample papers

CBSE Class 9-Question paper of science 2020 with solutions

CBSE Class 9-Sample paper of science

CBSE Class 9-Unsolved question paper of science 2019

NCERT Solutions for class 10 maths

Chapter 1-Real number	Chapter 9-Some application of Trigonometry
Chapter 2-Polynomial	Chapter 10-Circles
Chapter 3-Linear equations	Chapter 11- Construction
Chapter 4- Quadratic equations	Chapter 12-Area related to circle
Chapter 5-Arithmetic Progression	Chapter 13-Surface areas and Volume
Chapter 6-Triangle	Chapter 14-Statistics
Chapter 7- Co-ordinate geometry	Chapter 15-Probability
Chapter 8-Trigonometry

CBSE Class 10-Question paper of maths 2021 with solutions

CBSE Class 10-Half yearly question paper of maths 2020 with solutions

CBSE Class 10 -Question paper of maths 2020 with solutions

CBSE Class 10-Question paper of maths 2019 with solutions

NCERT Solutions for Class 10 Science

Chapter 1- Chemical reactions and equations	Chapter 9- Heredity and Evolution
Chapter 2- Acid, Base and Salt	Chapter 10- Light reflection and refraction
Chapter 3- Metals and Non-Metals	Chapter 11- Human eye and colorful world
Chapter 4- Carbon and its Compounds	Chapter 12- Electricity
Chapter 5-Periodic classification of elements	Chapter 13-Magnetic effect of electric current
Chapter 6- Life Process	Chapter 14-Sources of Energy
Chapter 7-Control and Coordination	Chapter 15-Environment
Chapter 8- How do organisms reproduce?	Chapter 16-Management of Natural Resources

Solutions of Class 10 Science Sample Paper and Question Papers for Term-1 and Term 2 2021-22 CBSE Board

Solution of Class 10 Science Question Paper Preboard 2021-22:Term 2 CBSE Board Exam

Solutions of Class 10 Science Sample Paper Term-1 2021-22 CBSE Board

Class 10 Science Sample Paper for Term 2 CBSE Board Exam 2021-22 with Solution

Solutions of Class 10 Science Question Paper Preboard Examination (First) 2021 -22 Class 10 Science

CBSE Class 10 – Question paper of science 2020 with solutions

CBSE class 10 -Sample paper of Science 2020

NCERT Solutions for class 11 maths

Chapter 1-Sets	Chapter 9-Sequences and Series
Chapter 2- Relations and functions	Chapter 10- Straight Lines
Chapter 3- Trigonometry	Chapter 11-Conic Sections
Chapter 4-Principle of mathematical induction	Chapter 12-Introduction to three Dimensional Geometry
Chapter 5-Complex numbers	Chapter 13- Limits and Derivatives
Chapter 6- Linear Inequalities	Chapter 14-Mathematical Reasoning
Chapter 7- Permutations and Combinations	Chapter 15- Statistics
Chapter 8- Binomial Theorem	Chapter 16- Probability

CBSE Class 11-Question paper of maths 2015

CBSE Class 11 – Second unit test of maths 2021 with solutions

NCERT solutions for class 12 maths

Chapter 1-Relations and Functions	Chapter 9-Differential Equations
Chapter 2-Inverse Trigonometric Functions	Chapter 10-Vector Algebra
Chapter 3-Matrices	Chapter 11 – Three Dimensional Geometry
Chapter 4-Determinants	Chapter 12-Linear Programming
Chapter 5- Continuity and Differentiability	Chapter 13-Probability
Chapter 6- Application of Derivation	CBSE Class 12- Question paper of maths 2021 with solutions
Chapter 7- Integrals
Chapter 8-Application of Integrals