Yer atmosferasi asosan molekulyar azot (N2) va molekulyar kislorod (O2) dan iborat bo'lib, u havo deb nomlangan aralashmada, azot 79% ga yaqin va kislorod 20%, qolgan qismi argon (1%) va boshqa gazlar, masalan, CO2 kamroq miqdorda (taxminan 400 qism million, ppm)
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