what causes wind to blow ?

Question

Urgent please need help with my homework thats why i am asking

Answer 1

Wind is the roughly horizontal movement of air (as opposed to an air current) caused by uneven heating of the Earth's surface. It occurs at all scales, from local breezes generated by heating of land surfaces and lasting tens of minutes to global winds resulting from solar heating of the Earth. The two major influences on the atmospheric circulation are the differential heating between the equator and the poles, and the rotation of the planet (Coriolis effect).

Given a difference in barometric pressure between two air masses, a wind will arise between the two which tends to flow from the area of high pressure to the area of low pressure until the two air masses are at the same pressure, although these flows will be modified by the Coriolis effect in the extratropics.

Winds can be classified either by their scale, the kinds of forces which cause them (according to the atmospheric equations of motion), or the geographic regions in which they exist. There are global winds, such as the wind belts which exist between the atmospheric circulation cells. There are upper-level winds, such as the jet streams. There are synoptic-scale winds that result from pressure differences in surface air masses in the middle latitudes, and there are winds that come about as a consequence of geographic features such as the sea breeze. Mesoscale winds are those which act on a local scale, such as gust fronts. At the smallest scale are the microscale winds which blow on a scale of only tens to hundreds of metres and are essentially unpredictable, such as dust devils and microbursts.

Answer 2

The motion of the earth forces winds in directions opposite to what you may think. This is known as the Coriolis Effect.

Simpler terms. Wind is the response of the atmosphere to uneven heating conditions. This creates pressure differences in the atmosphere causing the wind to blow from regions of high atmospheric pressure to low atmospheric pressure. The larger the pressure difference the greater the wind velocity.

Answer 3

Wind is caused because air, which does have weight, needs to go from high pressure areas to low pressure areas because of gravity. High pressure areas have cold, or cool air, that is heavier. Low pressure areas have warm air that rises to condense and form clouds and storms. That's why a hurricane, with it's extremely low pressure, is like a vortex, sucking in air to fill the void, hence, the very high winds.

Answer 4

Wind is caused by differences/changes in atmospheric pressure. Wind flows from high to low pressure and these areas are inflenced by the uneven heating of the earth's surface.

Answer 5

The heat of the sun on the earth's atmosphere. Hot air rises, cold air sinks. And while the air is moving up and down, the earth turns under it, and the coriolis forces produce spin. Add in factors like moisture from the oceans, dust that screens out sunlight, polar ice caps that reflect sunlight (for a little longer), and mountain ranges, and you get turbulent weather.

Answer 6

Wind is the roughly horizontal movement of air (as opposed to an air current) caused by uneven heating of the Earth's surface. It occurs at all scales, from local breezes generated by heating of land surfaces and lasting tens of minutes to global winds resulting from solar heating of the Earth. The two major influences on the atmospheric circulation are the differential heating between the equator and the poles, and the rotation of the planet (Coriolis effect).

Given a difference in barometric pressure between two air masses, a wind will arise between the two which tends to flow from the area of high pressure to the area of low pressure until the two air masses are at the same pressure, although these flows will be modified by the Coriolis effect in the extratropics.

Winds can be classified either by their scale, the kinds of forces which cause them (according to the atmospheric equations of motion), or the geographic regions in which they exist. There are global winds, such as the wind belts which exist between the atmospheric circulation cells. There are upper-level winds, such as the jet streams. There are synoptic-scale winds that result from pressure differences in surface air masses in the middle latitudes, and there are winds that come about as a consequence of geographic features such as the sea breeze. Mesoscale winds are those which act on a local scale, such as gust fronts. At the smallest scale are the microscale winds which blow on a scale of only tens to hundreds of metres and are essentially unpredictable, such as dust devils and microbursts.

You could get more information from the link below...

Answer 7

Main reasons for winds are
1) Uneven heating of earth by Sun which creates difference in pressure and winds blow.
2)The rotation of earth
3)Difference in geographical features.Above deserts there is low pressure campared to plains and mountains,hills.
1 and 3 work on the principle that air moves from high pressure to low pressure.

Answer 8

Areas of different atmospheric pressure. Air from areas of high pressure rushes to ajoining areas of low pressure - wind.

Answer 9

As the earth is moving round the sun at 18.5 miles per second you would expect a bit of wind

Answer 10

The land heats up, causing the air to heat up. This hot air rises & so cold air rushes in to fill the 'space' left by the rising hot air.