Unit+5

== Unit Brochure =Updated on 13/04/12= =13/04/12=

=Jonathan Thanks a million for your wonderful contribution. We'll make the best use out of it. Can we place those videos in the fourth grade netvibes page for he kids to watch at home? Thanks a million. Yolanda=
 * 13/04/2012**

Some illuminating & brief ( <3 mins each) videos :


 * The Earths core** - how did scientists discover what we know today?

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//Time Scale//: Until relatively recently the planet was thought to be young. It wasn't until the 1830's that people began to perceive the earth's surface as having been shaped by forces __operating over a very wide time__ span thanks to the work of geologists like Charles Lyell…..the 'Charles Darwin' of Geology….in fact Darwin was reading Lyell as he cruised down to the Galapagos.....
 * Geology**

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//Radiometric Dating// So, in the 1830's people realized that the planet was much older than they had previously thought but it wasn't until the 1950's that scientists began to date the planet at 4.5 billion years old.To do this they needed meteorites as a point of reference.If the history of the planet was condensed into 24 hours the entire human story would last 1 second. media type="custom" key="14204110"

Here a geologist explains the link between subduction activity and volcanic action.In addition, Sedimentary cliffs are shown as evidence of tectonic action. media type="custom" key="14204172"
 * Plate tectonics**

It wasn't until the 1960s that scientists developed the theory of plate tectonics.It was to Geo science what Einstein's theory of relativity was to physics. Volcanoes are 'cooling vents for the earth'. This video names the plates describes their dimensions and covers fault types media type="custom" key="14204384"

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 * Subduction zones**

"As always with geology it’s the landscape that tells the story….." " This is plate tectonics at work..." media type="custom" key="14204530"
 * Glaciers vs tectonics**

and here is a Geology website for kids in which all the key concepts are explained simply and clearly :


 * []**


 * JW**

= = =Check this link= []

**Good articles. Thanks for your contribution. What I find best about them is that they can give us new refreshing ideas for our coming unit as well. Yolanda**
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