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D - Science - Unit 7

Study Guide for Weather Formative - Winds

What is wind and what causes it? the horizontal movement of air caused by differences in air pressure
What causes differences in air pressure? the result of the UNEQUAL HEATING OF EARTH’S SURFACE, which creates convection currents or movement air (wind)
What is the Coriolis Effect? Earth’s rotation causes winds/ocean currents to curve
Which wind belt is the US located in? prevailing westerly
Which direction do the US winds and weather move? west to east
Where are the two areas where winds can be weak or non-existent? Doldrums & Horse Latitudes
Where are Doldrums found? around the equator - 0° latitude
Where are the Horse Latitudes found? 30° North and South latitude
What causes Global and Local Winds (Sea and Land Breezes)? unequal heating of Earth's surface
What is a land breeze? occurs from LAND to SEA, occurs at night
What is a sea breeze? occurs from SEA to LAND, occurs in the daytime
What is the jet stream? bands of high speed wind (usually between 100 and 200 mph)
Where do you find the jet stream? the upper level of the troposphere about 10km above Earth’s surface
How are air currents/winds related to ocean currents? Both are created by convection currents; warm air/water rising and cool air/water sinking creating a current of air/water
How is wind related to air temperature and air pressure? Differences in temperature (unequal heating of Earth’s surface) causes differences in air pressure.
What do difference in air temperature and air pressure cause? air to rise and sink creating movement in the atmosphere which we call wind
What happens to the density of warm air? it is less dense & it rises
What happens to the density of cool air? it is more dense & it sinks
Created by: lprinke