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Earth's Core Hotter Than First Believed

coreUsing a series of very technical tests, scientists from the French research facility CEA have determined that the Earth's core is roughly 6,000 degrees Celsius. That is approximately 1,000 degrees hotter than the temperature obtained by tests in the 1990s.

These new figures show that the center of the Earth is just as hot as the surface of the sun.

The experiment that supplied the new temperature used X-rays to probe tiny samples of iron at extraordinary pressures to examine how the iron crystals form and melt. The BBC reported that "To replicate the enormous pressures at the core boundary - more than a million times the pressure at sea level - they used a device called a diamond anvil cell - essentially a tiny sample held between the points of two precision-machined synthetic diamonds.

Once the team's iron samples were subjected to the high pressures and high temperatures using a laser, the scientists used X-ray beams to carry out "diffraction" - bouncing X-rays off of the nuclei of the iron atoms and watching how the pattern changed as the iron changed from solid to liquid."

 

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Earth Hour is coming. Here is a way to participate in developing environmental responsibility and awareness that climate challenges facing our planet need to be global. In its 6th year~ people around the world are being asked to shut off electric lights and other electrical devices for one hour on March 31st. Begun in New Zealand~ it is estimated that over 135 countries around the world will take part this year.Landmarks such as the leaning Tower of Pisa~ the Vatican~ the Eiffel Tower~ the...

Sign of the times....digital books!

A sign of the times that more and more people are reading e-books. Encyclopaedia Britannica Inc.~ which has published their encyclopedias for more than 200 years~ has announced that they will cease publishing their print editions~ focusing on their digital versions of their encyclopedia~ instead.

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Ireland~ the Emerald Isle

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Its official. I have gone Clicker Crazy! I have found ways to incorporate the clickers~ or remote control keypads as they are known in my school district~ into all kind of activities. These remote controls allow students to punch in answers electronically~ and the results are posted on the overhead screen. For instance~ the class answers a math problem~ punching in either the number or choosing a mutliple choice answer~ and then the screen shows what percent of the class got the...

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I developed plays based on the To Tell the Truth Game Show on several of our First Ladies. Perhaps~ you may find them useful to use with your students during this month which highlights the contribution of women.Go here to download(free) the following plays: http://www.gailhennessey.com/index.shtml?plays.html


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How about this: school districts use professional development days to allow educators to come together and share their best practices....

John Glenn~ First American to Orbit the...

Whenever astronaut John Glenn left on a mission as a fighter pilot~ he'd tell his wife~"Well~ I'm going down to the corner to buy some chewing gum". He said the same thing on Feb.20~ 1962~ when he left to board the Mercury capsule~ on a mission to orbit the Earth~ In a 9 1/2 by 6 ft. space...

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