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  • Kansas Legislator Proposes Bill to Outlaw Sustainability Education
    A bill has been introduced in the Kansas legislature this week that would prohibit the promotion of ...Read more

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    Kansas Legislator Proposes Bill to Outlaw Sustainability Education

    A bill has been introduced in the Kansas legislature this week that would prohibit the promotion of sustainability. Here is a link to the one-page bill: http://www.kslegislature.org/li/b2013_14/measures/documents/hb2366_00_0000.pdf. See report on Bloomberg News.
  • Earth's Center Is 1,000 Degrees Hotter Than Previously Thought, Synchrotron X-Ray Experiment Shows
    Scientists have determined the temperature near the Earth’s center to be 6000 degrees Celsius, 1000 ...Read more

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    Earth's Center Is 1,000 Degrees Hotter Than Previously Thought, Synchrotron X-Ray Experiment Shows

    Scientists have determined the temperature near the Earth’s center to be 6000 degrees Celsius, 1000 degrees hotter than in a previous experiment run 20 years ago. These measurements confirm geophysical models that the temperature difference between the solid core and the mantle above, must be at least 1500 degrees to explain why the Earth has a magnetic field. For more information about this study, see the press release from the European Synchrotron Radiation Facility.
  • Ocean Volcanic Rocks Contain Samples of Recycled Crust
    Scientists have long believed that lava erupted from certain oceanic volcanoes contains materials fr...Read more

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    Ocean Volcanic Rocks Contain Samples of Recycled Crust

    Scientists have long believed that lava erupted from certain oceanic volcanoes contains materials from the early Earth’s crust. But decisive evidence for this phenomenon has proven elusive. New research from a team including Carnegie’s Erik Hauri demonstrates that oceanic volcanic rocks contain samples of recycled crust dating back to the Archean era 2.5 billion years ago. Their work is published in Nature. Oceanic crust sinks into the Earth’s mantle at so-called subduction zones, where two plates come together. Much of what happens to the crust during this journey is unknown. Model-dependent studies for how long subducted material can exist in the mantle are uncertain and evidence of very old crust returning to Earth’s surface via upwellings of magma has not been found until now. For more information about these results, see the press release from the Carnegie Institution.
A polar bear in the Arctic
Click on image for full size
US Minerals Management Service, Alaska Region

The Arctic: Earth's North Polar Region

In the Arctic, you will find the Arctic Ocean surrounded by the continents of Europe, Asia, and North America. You will find the geographic North Pole and the magnetic North Pole there; both are in the Arctic Ocean, in an area that is currently covered year-round with sea ice. The aurora, called the Northern Lights in the Northern Hemisphere, can be visible in the night skies. Ice on the land is in glaciers. The Greenland ice sheet is the largest ice on land in the Northern Hemisphere. Most of the ice in the Arctic Ocean is called sea icesea ice.

On the sea ice polar bears look for seals. Seals are the polar bears favorite food. Seals live in the Arctic Ocean with many other types of marine creatures. On land, small plants and lichens grow in harsh and cold conditions. This environment is called Arctic tundra. On the tundra, it is usually cold, often windy, and there is not much precipitation. The soil is frozen most of the year. There are only a few mammals that can survive in such a cold place including reindeer (caribou) and arctic foxes. Many insects and birds live in the Arctic tundra during the summer and migrate south to warmer places during winter. Trees cannot grow in the tundra. Just south of the tundra, the climate is a little less cold and trees can grow.

There are people living in the Arctic. Inuit people live in the northern parts of North America, Greenland, and the Siberian region of Russia. People from Sweden, Finland, Norway, Iceland, and Greenland, who are relatives of the Norsemen or Vikings, also live in the Arctic.

Last modified February 27, 2007 by Lisa Gardiner.

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