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Ar is the basis of a common method for dating rocks. The conventional K-Ar courting process relies on the assumption that the rocks contained no argon at enough time of formation and that every one the next radiogenic argon (40Máy bay phun thuốc DJI Máy bay phun thuốc XAG Máy bay phun thuốc TopXGun Linh kiện - Phụ kiện Kiến thức