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Transverse waves are contrasted with longitudinal waves, where the oscillations occur in the direction of the wave. The standard example of a longitudinal wave is a sound wave or "pressure wave" in gases, liquids, or solids, whose oscillations cause compression and expansion of the material through which the wave is propagating. Pressure waves ...
Dublin Castle, which became the centre of Anglo-Norman power in Ireland, was founded in 1204 as a major defensive work on the orders of King John of England. [41] Following the appointment of the first Lord Mayor of Dublin in 1229, the city expanded and had a population of 8,000 by the end of the 13th century.
Map of early human migrations based on the Out of Africa theory; figures are in thousands of years ago (kya). [2]The peopling of the Americas began when Paleolithic hunter-gatherers (Paleo-Indians) entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the ...
The Solucar Complex, with the PS10 Solar Power Plant in the foreground and the PS20 in the background. In 2010 Spain became the solar power world leader when it overtook the United States with a massive power station plant called La Florida, near Alvarado, Badajoz. [220] [221] Spain is also Europe's main producer of wind energy.