The sky is the gaseous zone of our atmosphere...?
545778
*sighs*  Sad but true.  I'm nestled above the earth, sitting quietly, doing my own thing and, when asked, I usually answer through the "black hole".  \n\nmy words nothing more than a miasma of thoughts.....\n\n*perks up a bit*  Now, I suggest you go outside, look up and smile.  I've got a lot to say today.....
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Nitrogen is the major gas present in the earth's atmosphere(78%), followed by Oxygen(21%) and the rest 1% of other gases like Argon, hydrogen etc.
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There are in fact many different atmospheric layers as you move upward away from the earth. However, there are NOT different layers of gases. All the gases are sort of mixed.\n\nThe troposphere, the atmospheric layer that we live in, contains the most gases. This is due to gravity. Anything that has mass will be attracted to earth's gravity.\n\nThat is why when you move away from the earth there is less air. Less gravity = less air!\n\nThe higher you go in the troposphere, the colder it gets. That is also due to less air (holds heat).\n\nThe next layer up is the stratosphere. This layer is where most jets fly & where the atmospheric ozone layer exists.\n\nTemperatures in the stratosphere will get warmer due to the ozone layer. Ozone is an insulator & traps heat.\n\nAs you move higher, you will reach the mesosphere. And, as you may have already guessed, this layer contains even less air. It also gets pretty darn cold as you move away from the ozone layer. "Shooting stars" occur in this layer. Meteorites burn up as they enter our atmosphere.\n\nThe last layer is called the thermosphere. It has the least amount of air. But the odd thing is that this is the hottest layer!!!\n\nSounds strange??? Well here is why...\n\nAlthough there is less air to hold heat, there is still some present. Mind you, it is few & far between. Imagine being in the Astrodome & someone across the field threw a BB at you! That is how sparse the air particles are.\n\nHowever, we have said there is air! That air that is present is constantly bombarded with nasty cosmic rays! By this time, here is so much energy in the air particles that the temperature is astronomical (no pun intended).\n\nBecause of this, the thermosphere is often called the "heat sphere", just as it's name implies.\n\nSatellites are put into orbit in the thermosphere.\n\nTo get directly to your question... there are different layers because scientists decided to name them according to temperature changes.
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I'm told the atmosphere around it is mostly methane...
212469
Stratosphere\nThe stratosphere starts just above the troposphere and extends to 50 kilometers (31 miles) high. Compared to the troposphere, this part of the atmosphere is dry and less dense. The temperature in this region increases gradually to -3 degrees Celsius, due to the absorbtion of ultraviolet radiation. The ozone layer, which absorbs and scatters the solar ultraviolet radiation, is in this layer. Ninety-nine percent of "air" is located in the troposphere and stratosphere. The stratopause separates the stratosphere from the next layer.\n\nMesosphere\nThe mesosphere starts just above the stratosphere and extends to 85 kilometers (53 miles) high. In this region, the temperatures again fall as low as -93 degrees Celsius as you increase in altitude. The chemicals are in an excited state, as they absorb energy from the Sun. The mesopause separates the mesophere from the thermosphere.\n\nThe regions of the stratosphere and the mesosphere, along with the stratopause and mesopause, are called the middle atmosphere by scientists. This area has been closely studied on the ATLAS Spacelab mission series.
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I have no idea what you are asking.  Argon is 0.934% of the atmosphere.  Is that what you wanted?
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The mesosphere (from the Greek words mesos = middle and sphaira = ball) is the layer of the Earth's atmosphere that is directly above the stratosphere and directly below the thermosphere. The mesosphere is located about 50-80/85km above Earth's surface. Within this layer, temperature decreases with increasing altitude. The main dynamical features in this region are the atmospheric tides which are driven by momentum propogating upwards from the lower atmosphere and extend into the lower thermosphere
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Oh I know,  I know, is it the ozone? neeee Oh I'm sorry the answer we were looking for was actually atmosphere. Sorry little johnny better luck next time on guess that ocean of air around the Earth.
414227
You guys got a lot of it, but the sun is actually green. The atmosphere absorbs much of the light to make it more of a yellowish white light. Pollution and the ozone layer trap and absorb the green light that the sun produces. Then you see what you see. (were you looking at the sun??? :)
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When you say sky you must mean atmosphere. It divides into:\n\ntroposphere: The troposphere is the lowest layer of the atmosphere starting at the surface going up to between 7 km at the poles and 17 km at the equator with some variation due to weather factors.\n\nstratosphere: from that 7–17 km range to about 50 km, temperature increasing with height. \n\nmesosphere: from about 50 km to the range of 80 km to 85 km, temperature decreasing with height. \n\nthermosphere: from 80–85 km to 640+ km\n\nexosphere: from 640 to 900 km - space.\n\nSo you can say the sky is am least 640 and at most 900 high.
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troposphere: From the Greek word "tropos" meaning to turn or mix. The troposphere is the lowest layer of the atmosphere starting at the surface going up to between 7 km at the poles and 17 km at the equator with some variation due to weather factors. The troposphere has a great deal of vertical mixing due to solar heating at the surface. This heating warms air masses, which then rise to release latent heat as sensible heat that further buoys the air mass. This process continues until all water vapor is removed. In the troposphere, on average, temperature decreases with height due to expansive cooling. \n\nstratosphere: from that 7–17 km range to about 50 km, temperature increasing with height. \n\nmesosphere: from about 50 km to the range of 80 km to 85 km, temperature decreasing with height. \n\nthermosphere: from 80–85 km to 640+ km, temperature increasing with height. \n\nThe boundaries between these regions are named the tropopause, stratopause, and mesopause.\n\nAtmospheric regions are also named in other ways:\n\nionosphere – the region containing ions: approximately the mesosphere and thermosphere up to 550 km. \n\nexosphere – above the ionosphere, where the atmosphere thins out into space. This is the last major atmosphere. (“Exo” means “outside” in Greek.) \n\nmagnetosphere – the region where the Earth's magnetic field interacts with the solar wind from the Sun. It extends for tens of thousands of kilometers, with a long tail away from the Sun. \n\nozone layer – or ozonosphere, approximately 10 - 50 km, where stratospheric ozone is found. Note that even within this region, ozone is a minor constituent by volume. \n\nupper atmosphere – the region of the atmosphere above the mesopause. \n\nVan Allen radiation belts – regions where particles from the Sun become concentrated.
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Atmosphere\nPascal\nBar\nlbs/cm^2
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The atmosphere reaches over 560 kilometers (348 miles) from the surface of the Earth
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It is possible for the earth to hold an atmosphere due to its gravitational field.  All objects (of any size) are attracted to other objects (of any size) this is called gravity.  The earth's gravitational field therefore holds the oxygen, nitrogen, etc. inside its gravitational field because due to its size its gravity pulls the oxygen molecules to it.  This is also reason why there is more oxygen air etc.  at sea level than in the mountains.  As you ascend higher the gravity is less than at sea level so less air is held by gravity.
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Primary(aprox. 46 billion years ago) atmhosphere was included hydrogen, helium and ammonia. \nSecondary (current) atmosphere eveolved as volcanic activity added nitrogen, water vapor and CO2 to the atmosphere. And appearance of green plants added free oxygen to the air. \nAdditionally there are some variable components of atmosphere:two imporatnt ones; water vapor and ozone. Permanent compnonets are NITROGEN, OXYGEN, ARGON and CO2.
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NO!\n\nIN THE HEAVENS: ABOVE OUR HEADS....\nIN SPACE......\n\nOUTSIDE OF THE EARTH'S ATMOSPHERE\n\nAMONGST THE PLANETS\n\n THERE IS ABSOLUTE ORDER\n\nHERE ON EARTH.....\nJUST PICK UP THE LOCAL PAPER....WATCH THE LOCAL NEWS CHANNELS.....
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The Earth's atmosphere has no definite boundary, slowly becoming thinner and fading into outer space. Three-quarters of the atmosphere's mass is contained within the first 11 km of the planet's surface. This lowest layer is called the troposphere. Further up, the atmosphere is usually divided into the stratosphere, mesosphere, and thermosphere. Beyond these, the exosphere thins out into the magnetosphere (where the Earth's magnetic fields interact with the solar wind). An important part of the atmosphere for life on Earth is the ozone layer.\n\nThe atmospheric pressure on the surface of the Earth averages 101.325 kPa, with a scale height of about 6 km. It is 78% nitrogen and 21% oxygen, with trace amounts of other gaseous molecules such as water vapor. The atmosphere protects the Earth's life forms by absorbing ultraviolet solar radiation, moderating temperature, transporting water vapor, and providing useful gases. The atmosphere is one of the principal components in determining weather and climate.\n\nBecause hydrogen gas is light and based on Earth's mean temperature, achieves escape velocity, unfixed hydrogen leaves the Earth. For this reason, the Earth's environment is oxidizing, with consequences for the chemical nature of life which developed on the planet.\n\nYou could get more information from the link below...