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The Polar Ice Caps Created by Diane McDonough March 2012.

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Presentation on theme: "The Polar Ice Caps Created by Diane McDonough March 2012."— Presentation transcript:

1 The Polar Ice Caps Created by Diane McDonough March 2012

2 What is happening to the polar ice caps?

3 Since 1979, the size of the summer polar ice cap has shrunk more than 20 percent.


5 Why are the ice caps shrinking?

6 MELTING The polar ice caps are undergoing a physical change.

7 MELTING is a change in state from a solid to a liquid.

8 MELTING occurs when the the water molecules gain enough thermal energy………..

9 Causing them to vibrate faster which raises their temperature.

10 Eventually the water molecules Break free from their position in the the ice crystals.

11 The overall sea water level rises. Walruses, seals, and polar bears are affected by the loss of the ice caps. As a result the ice caps shrink.

12 The melting of the ice caps is affecting my family.

13 The ice is freezing later in the fall and melting earlier in the spring This shortens our hunting season.

14 Where is all the food? The average bear’s weight has dropped 15%

15 Where will we go for food?

16 We have to swim to larger sea ice to hunt.

17 Which is further off the shore.

18 Many are unable to make the swim, Especially the cubs.

19 Our population is declining!

20 Why is this happening to our home?

21 GLOBAL WARMING The melting of the ice caps is caused by


23 CAUSES OF GLOBAL WARMING Depletion of the ozone layer Production of greenhouse gases: carbon dioxide, methane, and nitrous oxide Include the following chemical reactions

24 CHEMICAL REACTIONS Occur when one substance breaks down into two or more substances Two or more substances combine, forming one or more new substances. OR

25 The Ozone Layer is a layer in the Earth’s atmosphere that protects the Earth from the sun’s harmful ultra-violet rays.

26 Occurs because of a Chemical Reactions involving Chlorofluorocarbons OZONE DEPLETION

27 The chemical reaction involved…….

28 Then…….

29 Finally……

30 Chemical reactions also produce greenhouse gases That trap heat in Earth’s atmosphere

31 Sources of greenhouse gas

32 1.Fossil fuel 2.Trees and Wood products 3.Solid waste Carbon dioxide is produced through combustion of

33 The chemical reaction for burning wood is

34 Methane is produced During the production and transport of coal, natural gas, and oil From livestock and other agricultural practices By the decay of organic waste in landfills

35 CO 2 + 4H 2 = CH 4 + 2H 2 O Landfill Chemical Reaction:


37 During agricultural and industrial activities Combustion of fossil fuel Nitrous oxide is produced



40 Stop using or reduce the use of ozone depleting chemicals Chlorofluorocarbons, halons, methyl bromide

41 Plant a tree Carbon dioxide is also removed from the atmosphere (or “sequestered”) when it is absorbed by plants as part of the biological carbon cycle.


43 Ride a bike, walk, or take public transportation

44 Drive a hybrid or more fuel efficient car

45 Use alternative energy sources

46 Use ENERGY STAR appliances and light bulbs

47 Turn off lights and appliances


49 Be part of the solution!

50 Presented in this content trailer is one of the theories on Global Warming. The other theory viewed by scientists is that Global Warming is a natural phenomena that has occurred in cycles throughout Earth’s history. Global Warming Theories

51 NASA Data Reveals 'Average' Ozone Hole in 2007

52 Music: John Mayer: Waiting for the World to Change David Bowie: Changes Michael Jackson: Man in the Mirror Created by: Diane McDonough Special thanks to Dan Williams

53 References polar-melt/ php bears.aspx

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