Planetary Surface Winds 0.0 / 5 ? GeographyWeather systemsA2/A-levelAQA Created by: OctaviaLCreated on: 29-05-16 19:03 What are winds? Horizontal movements of air on Earth's surface as a result of differences in air pressure. 1 of 12 What direction do winds blow? From high to low pressure. 2 of 12 What happens if air temperature increases? Air expands and rises, reducing pressure. 3 of 12 What happens if air temperature decreases? Air becomes denser and sinks, increasing pressure. 4 of 12 What is the pressure gradient? The gradual change seen in the pattern of isobars on a weather map. 5 of 12 What influences wind direction at the small scale? Land and sea. 6 of 12 What can wind affect? Temperature. 7 of 12 What affects temperature of the wind? It's origin and the surface over which it has travelled. 8 of 12 Why in summer do winds blowing onto land from the sea reduce air temperature? The sea over which they have travelled is cooler than the land surface. 9 of 12 Where are polar easterlies found and which direction do they blow? Polar cell. From North-East to South-West. 10 of 12 Where are the westerlies found and which direction do the blow? Ferrel cell. From South-West to North-East. 11 of 12 Where are the trade winds found and which direction to they blow? Hadley cell. North-East to South-West in the Northern hemisphere, South-East to North-West in the Southern Hemisphere. 12 of 12
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