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A heatwave is caused when a system of high pressure moves into an area. Air from upper levels of the atmosphere are pulled towards the ground, increasing in temperature. The stronger the system of pressure, the longer and more severe the heatwave. In 2003, Western Europe was hit with its hottest summer since around 1540. An estimated 70,000 died and the heatwave was damaging to crops and water supplies.

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13y ago

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