we Feel ,we hear the wind but we do not we see we do not know how it started blowing.
Wind is simply the movement of air above the ground, and the reason for the movement of air is attributable to changes in temperature when the air warms, it expands and light weight rises to the top of Vihrk cold air to take place at the sites of low, and thus results in all these moves what we call the (wind).
There are two types of winds, global wind (so to speak) and local winds, starting with the world's major wind from the equator, where the hottest heat of the sun as possible.
In that region air rises to high levels in the sky and moves toward Taqbin North and South, and when cut about a third of the distance toward the poles, it has cooled somewhat and began to land again to the earth, and return some of it to the equator for the Heat again and follow the others to the poles.
Local winds arise from collisions of cold air masses high pressure air or warm air masses and low pressure air this kind of wind does not usually lasts for a long time, after several hours or several days at the most global wind back for an encore.
And other local winds arise as a result of heat and cold everyday of the land.
On moving day gets cold air above the seas and the ocean towards the land and called (sea breeze) and at night the cold air moves from land to sea, because the latter will be warm at night over land and called (land breeze).
Out of the monsoon:
Monsoon label Arab fired on the wind that blows from sea to land in the warm season of the year and vice versa in the cold season of the year and took this name from Arabic into Latin became (Monson).
These winds often occur in areas of East Asia, where the warm season in these areas will be very rainy and cold season is very dry.
The reason for changing the direction of the wind and rain in these areas that when a vast area of land where the land cools and heats Bsra than the speed of the hottest and coldest seas surrounding it.
Thus, the land in the regions of Central and South Asia hot over the Indian Ocean in the south, and the Pacific in the east causes the difference in this heat to a low pressure on land winds of wind from the sea to the land and called the (summer monsoon) in the fall and winter, the opposite will happen the wind is blowing from dry land to the sea.
The regions of South and East Asia most vulnerable to such Alrj because of the land area of vast where, have been used by sailors of this phenomenon to determine the direction of journeys and voyages to and from India They were traveling from India to Africa during the winter and come back to India in the summer.