Presentation is loading. Please wait.

Presentation is loading. Please wait.

Outline of Presentation What is the Ozone layer? What is the Ozone layer? How is ozone created and destroyed? How is ozone created and destroyed? What.

Similar presentations


Presentation on theme: "Outline of Presentation What is the Ozone layer? What is the Ozone layer? How is ozone created and destroyed? How is ozone created and destroyed? What."— Presentation transcript:

1

2 Outline of Presentation What is the Ozone layer? What is the Ozone layer? How is ozone created and destroyed? How is ozone created and destroyed? What is the Ozone hole? What is the Ozone hole? What are the causes of Ozone Depletion? What are the causes of Ozone Depletion?

3 Outline of Presentation What are Ozone Depleting Substances? What are Ozone Depleting Substances? Effects of the depleting Ozone to humanity and all living things. Effects of the depleting Ozone to humanity and all living things. Impacts of the Ozone Layer depletion to the Earth. Impacts of the Ozone Layer depletion to the Earth. How can the Ozone layer be saved? How can the Ozone layer be saved?

4 The Ozone Layer is a thin, fragile shield that envelops the entire earth which efficiently and effectively filters and screens almost all of the harmful ultraviolet rays.

5 air molecules Ozone is a gas that is naturally present in the atmosphere. It is a molecule made up of three oxygen atoms. Its chemical symbol is O 3.

6 Earths atmosphere is divided into four layers with different elevation and temperature profile: 1. Troposphere 2. Stratosphere 3. Mesosphere 4. Thermosphere

7 THE GOOD AND BAD OZONE

8 The Solar Radiation The Earths atmosphere is exposed to radiation from the sun. Energy is transferred from the sun to the earth in the form of electromagnetic energy. Electromagnetic energy can be divided into spectrum, in which protons that transfer energy have both a wavelength and energy level. This radiation includes ultraviolet, visible and infrared radiations.

9 There are three categories of UV: UV-A: Most UV-A is able to reach the earths surface. UV-A: Most UV-A is able to reach the earths surface. UV-B: 90% of UV-B is blocked off by the ozone layer. UV-B: 90% of UV-B is blocked off by the ozone layer. UV-C: 100% of UV-C is blocked off by the ozone layer. UV-C: 100% of UV-C is blocked off by the ozone layer.

10

11 HOW OZONE IS CREATED IN THE STRATOSPHERE

12 UV radiation strikes ozone molecule… … releasing one oxygen atom O O O O OO How ozone is naturally destroyed in the Stratosphere

13

14 The depletion or the loss of the blocking effect of the ozone layer against ultraviolet rays is what we call the OZONE HOLE. What is the

15

16 The Ozone Depletion Degradation of the Ozone Layer. When even a small amount of ozone layer is lost, more ultraviolet light from the sun can reach and destroy the Earth. Caused by the chemical reaction involving chlorine and bromine which are also called Ozone Depleting Substances (ODS).

17 CHLOROFLUOROCARBONS or CFCs HALONS Simple chemicals containing chlorine, fluorine and carbon. CFCs are used in refrigerators, air- conditioners, spray cans, solvents, foams, other application. CFCs are used in refrigerators, air- conditioners, spray cans, solvents, foams, other application. Contain at least one bromine atom Halons are primarily used in fire extinguishers Halons are primarily used in fire extinguishers OZONE DEPLETING SUBSTANCES (ODS) AND THEIR USES

18 HYDROBROMOFLUOROCARBONS (HBFCs) are used in fire extinguishers. HYDROBROMOFLUOROCARBONS (HBFCs) are used in fire extinguishers. CARBON TETRACHLORIDE and METHYL CHLOROFORM are used as solvents. CARBON TETRACHLORIDE and METHYL CHLOROFORM are used as solvents. HYDROCHLOROFLUOROCARBONS (HCFCs) were developed as the first major CFC replacement. HYDROCHLOROFLUOROCARBONS (HCFCs) were developed as the first major CFC replacement.

19 OZONE DEPLETING SUBSTANCES (ODS) AND THEIR USES METHYL BROMIDE (CH 3 Br) is used as a fumigant and in quarantine treatment. METHYL BROMIDE (CH 3 Br) is used as a fumigant and in quarantine treatment.


Download ppt "Outline of Presentation What is the Ozone layer? What is the Ozone layer? How is ozone created and destroyed? How is ozone created and destroyed? What."

Similar presentations


Ads by Google