Karina's blog

I think we should watch this video because it is a good intro to how electricity works and i think it would be important since we did not cover this topic in grade 8.  

By Alison and Karina

Lasers are used in DVD and CD players to burn the data on the disk. CD, DVD, and Blu-Ray recorders all use lasers to put the information into the disk.  Laser printers use lasers to transfer the data onto paper.  

Lasers are also used to measure speed and distance.  

 Lasers are also used to determine from a distance the environmental toxins in a column of smoke.  

Laser has become one of the most important tools to researchers within physics, chemistry, biology and medicine throughout the world and is used to:

- register ultra fast chemical processes such as the bonding between atoms to form molecules;
- study the process when cells split, or a virus enters into a cell;
- manipulate molecules down to extremely low temperatures;
- transfer as much energy as possible to different materials in a short time to obtain different types of emissions.

Lasers are also used in medicine.  For example, brain surgery, removing birthmarks, warts and skin discoloration.  Lasers are also used in laser eye surgery.  Carbon dioxcide lasers are used in many tpes of surgery.  Lasers are used to remove tattoos and certain tumors in the human body.  

Lasers are used at the grocery store. Lasers scan the barcode on your packages to tell the computerized register what you're buying and how much it costs.

Lasers are used the cut, drill and weld different materials. 

Some computer mice have a laser.   

Lasers are used in Dentistry:

- remove tooth decay

- remove bacteria

- reshape gums

- Biopsy or lesion removal

- whiten teeth 

http://nobelprize.org/educational_games/physics/laser/facts/use.html 

http://nobelprize.org/educational_games/physics/laser/facts/applications.html

http://www.wisegeek.com/what-are-lasers-used-for.htm

 Science Pinhole Experiment Reflection

 Letter by: Josh, Alina, Karina, Gavi -- 8M 

Rafe and Sam-  This is the letter you can send to people... just add a concluding sentence or something. :) 

Dear _______________ ,

    We are grade 8 science students from Stratford Hall and we are writing this letter on behalf of all our peers.  We recently watched a video called “Water is Life” in our Science class, and it discussed water issues around the world.  One issue that was explained was the decline of ground water, and water in general, in Kaladera, India.  

    Coca-Cola has opened up a new factory in many communities in India, and many farmers are experiencing severe water shortages, practically all their wells have gone dry and some have had to move because they can not support the land and their families.  Over 70% of India's population makes a living related to Agriculture.  For every one liter of pop Coke makes they need three liters of water, farmer’s may use more then that, but the water they use goes back to the water cycle, while the water Coke uses travels thousands of miles in Coke and pop bottles and the water does not come back to the local communities. This process is not only harming people but also the eco-system around it.  This is a major problem that should be solved properly and effectively. 

    According to indiaresource.org, Coca-Cola extracted 1,48,259 cubic metres of water within seven months from March to September 2003. 

    Not only is Coke extracting water from many Indian communities, but it has also been indiscriminately discharging its waste water into the fields around its plant and sometimes into rivers in the area, including the Ganges. Coke causes Kaladera’s drink water to disappear, but also replaces it with waste water.  Both these problems effect the not only the local water cycle and eco-system, but also the national.  

   This image below shows the groundwater levels from 1990, to 2009. According to this website (http://ow.ly/1ld7M) Coca-Cola's operations started in 2000, and obviously the groundwater levels dipped ever since Coca-Cola started operations. 

 In Plachimada and Mehddiganj, India, Coca-Cola has been distributing its solid waste to the farmers and giving them to use for “fertilizer”. According to the BBC found cadium and lead after doing some test on this waste, the results showed that the waste was highly toxic and made the government pass a law to stop disturbing toxic waste to harmless farmers.  So not only are the farmers losing water, they are also getting toxic waste to put on their lands!

    “ For the last two years the company has been stealing precious drinking water from deep down the earth and our wells have gone all dry” explained Mylamma, and elderly tribe women who is fighting for her right to have fresh, free water in her home country. She is one of the leaders of water war against Coke stealing their water. 

We are very fortunate to be able to access free, clean drinking water.  We feel that it is a global human right, to have access to water.  Coke is stealing India's drinking water, and that is unacceptable.  Together we can help the communities in India in getting their water back.  A class of twenty 8th grader students, cannot change Coke's affect on many Indian communities, but with your help, we can.  

 http://www.buzzle.com/articles/sewage-water-pollution.html

http://www.nrdc.org/water/pollution/sewage.asp

http://www.nrdc.org/water/pollution/sewage/contents.asp

http://environment.about.com/od/waterpollution/a/canadasewage.htm

http://www.thecanadianencyclopedia.com/index.cfm?PgNm=TCE&Params=A1ARTA0...

http://www.umich.edu/~gs265/society/waterpollution.htm

http://www.ca.uky.edu/enri/pubs/enri404.pdf

http://www.articlesbase.com/technology-articles/sewage-water-pollution-a...

http://vancouver.ca/sustainability/building_watersewer.htm    

http://www.youthcanworld.org/PN/dumpingsewage.html

http://www.wateraid.org/international/what_we_do/how_we_work/urban_work/...

http://www.unicef.org/pon97/water5.htm

http://en.wikipedia.org/wiki/Sewage_treatment

http://www.sewage-problems.com/

-Covers more than 70% of our planets surface

-5 major oceans:

- Pacific

- Atlantic

- Indian

- Arctic

- Southern 

-Salt water -->  caled salinity 

-Always moving --> around surface ocean in the upper 400 m of the ocean 

-Moves around the ocean by upwelling (brings water from the deep ocean to the shallow areas) and downwelling (send water from the surface to the deep ocean) 

- The ocean water moves with tides --> created by gravitational force.  

- Ocenas make up 97% of worlds water

- The ocean has layers

Video:

http://www.youtube.com/watch?v=3GRA7ilM708&feature=PlayList&p=654EA868883AB315&playnext=1&playnext_from=PL&index=19

Sources used:

http://www.theodora.com/maps/new8/oceans.gif

http://www.windows.ucar.edu/tour/link=/earth/Water/ocean.html

http://www.exploringnature.org/graphics/glossary/ocean_layers.jpg