We know that if the atmosphere did not exist, the land would go out of time. Imagine for a moment for the sake of argument that the earth has an atmosphere indeed, as it is today, if the sun is absent. The lack of sun would mean lack of time and not only due to a solid form the atmosphere will be frozen. In fact, the interaction between the heat of the sun and our atmosphere builds air masses, while circulation patterns appear due to that. Pressure differences motivate air movements and wind is the end result of it.
As in the case of other materials, the air in Earth's atmosphere is made of molecules constantly moving. Increased air pressure is where the densest concentration of molecules. Since air molecules are governed by gravity, higher air pressure is nearest the earth's surface and with altitude that decreases. The atmospheric pressure at sea level is approximately 14 pounds and half on each square inch about which are usually not much more aware.
If air pressure is measured in hectopascals or millibars, normal air pressure ranges from 980-1040 hectopascals, while local conditions depends to a large extent.
A different speeds these molecules incessantly move while the speeds depend on temperature, the lower the temperature slower is the peed and for higher temperature is the fastest speed. Molecules are accelerated with a mass of air is heated and that results in an expansion of air. The density of the molecules decreases as expansion takes place and therefore the mass of air becomes lighter. The air mass that has become clearer now begins to rise. Convection is the term for the process.
Throughout the world is in constant convection in the atmosphere. However, neither regular nor uniform is the process. It depends on many local factors whether convection will take place, and if it does in all, how much will be.
As air rises it cools. So at the time the warm air masses get cooled and rising due to his return begins to sink. With the rise of air, low pressure results. High blood pressure is the result which is sinking. As the balance is the goal of the atmosphere, air moves from high pressure areas to low pressure. The wind is the very movement of air. Plus the difference between high pressure and low pressure zones, the strongest winds would be the result.
An elliptical orbit of the earth or the third rock from the sun and the next to complete the time it takes is one year. The time to complete an orbit of stretch marks the year of the earth. Since the elliptical orbit of Earth, in certain parts of the year is really about more sun. However, this does not cause seasons even though more solar heat the earth receives then.
The earth movement is not limited to its journey through of space in its own orbit, but also turns its axis like a top. In each 24-hour shift to complete. Alteration between day and night is caused by the rotation of the Earth. Climatic conditions vary from day and night as is reflected in high and low temperatures and the effect of that is felt in weather patterns as well.
In the axis of the Earth is tilted about 23 degrees and that really makes the change of seasons. Due to tilting different parts of the earth is closer to the Sun and around the sun the earth travels in its orbit. Therefore, during certain times of the year in different parts of the earth receive different amounts of heat.
In December, Northern Hemisphere receives less light since the North Pole is tilted away from the sun then. Thus, the days become shorter there while the temperatures down.
But as the Earth moves in its orbit, North Pole is closer to the sun due to the slope of the land. Until June 21 follows close to the sun and then the summer reaches its maximum. That same day, the sun is just above the Tropic of Cancer. Around the sun the earth continues to move until 21 December when the winter reaches its highest point and the cycle is complete.
Just opposite are the seasons in the southern hemisphere, though the same cycle it experiences. In December, the hemisphere South is the closest to the sun and therefore it is summer there. Quite logically June21 is the date marked for winter peak in the southern hemisphere.
The latitudes middle and high, ie above 23.5 degrees north and below 23.5 degrees south latitude, enjoy four seasons precisely. Normally for the tropics wet and dry seasons only two seasonal variations.
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