地球大气层,又叫大气圈,因重力关系而围绕着地球个一层混合气体,是地球最外部个气体圈层,包围着海洋搭陆地,大气圈没确切个上界,拉离地表2000-16000公里高空仍有稀薄的气体搭基本粒子,拉地下、土壤搭某些岩石中也会有少量气体,渠拉也可视同大气圈个组成部分,地球大气个主要成分为氮、氧、氩、二氧化碳搭弗到0.04%比例个微量气体,箇些混合气体即称为空气。
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