WHAT IS THE WEATHER?
Let's try to understand.
We live on planet Earth. It revolves around the sun. The sun's rays bring us warmth and light, they give life to plants, animals and people. Our Earth is spinning, like whirligig. The sun shines on it then with one or the other. That is why the day gives way to night.

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But the sun warms our planet differently. In the south, the sun shines brighter and weaker in the north. That is why in the north for a long time there is snow.
And there is on earth and those regions where the winter snows did not happen. In some places, the sky is often haze clouds, drizzle and fog bank. And in almost every other day clear and sunny.

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But it's not just the sun. What else is there? In the air. In the very air we breathe all.
When the Northern Hemisphere winter in the Southern Hemisphere is summer.
Our earth is surrounded by air cladding. This invisible ocean of air, in
which we live is called the atmosphere.

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The atmosphere.

The atmosphere is an air shell of the Earth, which takes part in its diurnal and annual rotation. It is an object of study of meteorology. The atmosphere is a mixture of several gases - air, which weighed colloidal impurities - dust, droplets, crystals, etc. In the height of the air does not change much. However, starting from a height of about 100 km, together with molecular oxygen and nitrogen, and elemental appears as a result of photo dissociation of molecules, and begin the gravitational separation of gases.

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Above 300 km in the atmosphere prevailing atomic oxygen above 1000 km - helium and then the atomic hydrogen. In this case, from the heights of a few less than 100 km of the molecules and atoms of atmospheric gases, especially oxygen and hydrogen is ionized, i.e., carries electrical charges. The pressure and density of the atmosphere decreases with height, about half of the atmospheric mass is concentrated in the lower 5 km.

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Sharp upper boundary of the atmosphere has a density of its constituent gases are gradually approaching the gas density in interplanetary space. At altitudes ranging from 2 to 20 thousand kilometers, in the so-called earthly crown, on average, contains about 1000 of ionized particles per cm3. However, in the interplanetary space outside of the crown are not more than 100 particles (protons and electrons) in each cm3.