Door Kaj Rietberg | okt 14, 2007
Aardrijkskunde: Gebeurtenissen per week.
Op de website Geo Nieuws plaatsen ze welke week een bericht waarin ze verwijzen naar aardrijkskundige zaken op de wereld gebeurt in de afgelopen week. Je gaat naar een kaart van de wereld waarop een aantal plaatjes aanklikbaar zijn. Zo blijf je goed op de hoogte van het gebeuren in de wereld. Ze hebben de teksten zelf vertaald en zijn dus in het Nederlands te lezen. Het is gebaseerd op www.earthweek.com.
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oudste boom in zweden
Swedish scientists say they have discovered a tree that is nearly 10,000 years old, making it the oldest living tree ever discovered on the planet.
Leif Kullman, professor of physical geography at Umea University, said the 9,950-year-old spruce on Fulu Mountain is one of three trees determined to be older than the “Methuselah†tree in Southern California, which had previously been believed to be the world’s oldest at between 4,500 and 5,000 years in age.
Wood pieces around the spruces have the identical genetic signature as the tree growing above them, and carbon dating of the old tree fragments show they range from 5,660 and 9,550 years in age.
“These were the first woods that grew after the Ice Age,” said Lars Hedlund, who is responsible for environmental surveys in the Swedish county of Dalarna and collaborator in climate studies there.
Kullman said the trees survive harsh climates by growing for centuries as bushes near the ground.
But he said climate warming over the past few decades has caused them to send up trunks that look like they have “popped up like mushrooms in the soil.â€
The trees appear to have survived for so long due to their ability to push out a new trunk once an older one dies.
apr 19th, 2008
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