Download Depletion of Ozone Layer PowerPoint Presentation

Login   OR  Register
Home / Science & Technology / Science & Technology Presentations / Depletion of Ozone Layer PowerPoint Presentation

Depletion of Ozone Layer PowerPoint Presentation

worldwideweb By : worldwideweb

On : Jan 08, 2015

In : Science & Technology

Embed :

Login / Signup - with account for

  • → Make favorite
  • → Flag as inappropriate
  • → Download Presentation
  • → Share Presentation
  • Slide 1 - Depletion of Ozone Layer 6S Yeung Wut Pan 6S Tsang Chi Ho
  • Slide 2 - What is ozone layer? a layer in Earth’s atmosphere contains relatively high concentrations of ozone (O3) absorbs 93-99% of the sun's high frequency ultraviolet light located in the lower portion of the stratosphere
  • Slide 3 - The following equations describe how ozone is formed- O2 ------------O + O O+ O2 ------------O3
  • Slide 4 - Ozone and ultraviolet Ultraviolet is a kind of radiation Divided into three categories Harmful to humans Absorbed and screened by ozone
  • Slide 5 - What caused ozone depletion? By free radical catalysts Emissions from jumbo jets and civil aircraft increased concentrations of chlorine and bromine, nitrogen oxides, and hydrogen liberated by the action of ultraviolet light initiate and catalyze a chain reaction
  • Slide 6 - How the ozone layer is destroyed? CFCs (chlorofluorocarbons) commonly used in refrigeration and aerosol broken down by UV radiation and give out chlorine atoms which acts as the catalyst: CFCl3---------CFCl2 + Cl Cl +O3 ------- ClO +O2 ClO +O ------- Cl +O2 The Cl atom is then used again to destroy more ozone molecules.
  • Slide 7 - ppt slide no 7 content not found
  • Slide 8 - Where does the most ozone depletion occur? A very large ozone hole forms at Antarctica. November 27, 2008
  • Slide 9 - Results of ozone layer depletion Ozone levels drop being unable to absorb ultraviolet radiation an increase of skin cancer and eye cataract yield of crops decrease Economic loss global warming
  • Slide 10 - What have been done? Monitor the use of CFCs Compounds containing C–H bonds designed to replace CFCs Lower sulphur jet aircraft fuel and redesigned engines Reduce vehicles’ exhaust emissions Develop less polluting propulsion systems
  • Slide 11 - Is the ozone layer recovering? The report from United Nations Environmental Programme in 2006 states that the Montreal Protocol is working. The ozone layer is expected to recover to pre-1980 levels in 2050. If all emissions of ozone depleting substances were eliminated, the recovery will advance by 15 years.
  • Slide 12 - What can we do to help? Use no CFCs items Conduct regular inspection and maintenance of air-conditioning and refrigeration appliances CFCs containing items should be recovered or recycled
  • Slide 13 - Sources http://www.nasa.gov/vision/earth/environment/ozone_resource_page.html http://www.epd.gov.hk/epd/textonly/english/environmentinhk/air/ozone_layer_protection/wn6_protect.html http://esrl.noaa.gov/csd/assessments/2002/qandas.html http://ozone.unep.org/index.shtml
  • Slide 14 - The end
Male Female Free PowerPoint Template

Male Female

Views : 427

Blue Eye Free PowerPoint Template

Blue Eye

Views : 617

Autumn Free PowerPoint Template


Views : 401

Quit Smoking Free PowerPoint Template

Quit Smoking

Views : 382

Germ Free PowerPoint Template


Views : 600

Burger Free PowerPoint Template


Views : 366

ECG Heart Beat Free PowerPoint Template

ECG Heart Beat

Views : 1288

Morning Running Free PowerPoint Template

Morning Running

Views : 568

Sperm Free PowerPoint Template


Views : 589

Drone Free PowerPoint Template


Views : 3492

Law Rules Free PowerPoint Template

Law Rules

Views : 1429

Snow Man Free PowerPoint Template

Snow Man

Views : 354

Baby Feet Free PowerPoint Template

Baby Feet

Views : 398

Pregnant Lady Free PowerPoint Template

Pregnant Lady

Views : 1386

Aids Free PowerPoint Template


Views : 428

Valuable Key Free PowerPoint Template

Valuable Key

Views : 683

Back to School Free PowerPoint Template

Back to School

Views : 373

Car Free PowerPoint Template


Views : 383

AI Free PowerPoint Template


Views : 536

Computing Information Technology Free PowerPoint Template

Computing Information Technology

Views : 373

Description : PowerPoint presentation on Depletion of Ozone Layer, download now ppt of Depletion of Ozone Layer

Tags : Depletion of Ozone Layer