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The planet's wandering magnetic poles

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Author Topic: The planet's wandering magnetic poles  (Read 222 times)
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« on: December 27, 2007, 08:17:08 pm »

Probing the past

One debate among English historians regards what stimulated urban development in the fledgling nation. King Alfred, who with his brother unified the nobility in the mid-800s, commissioned earthwork defenses in many areas of southern England after Viking attacks in the 860s. One big question: Were the cities encircled by those earthworks well developed before construction of the defenses, or did those fortifications provide the protection needed for small villages to grow into thriving cities?

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