that it contained years ago是定语从句,修饰先行词elements.
contained是是主动语态的一般过去式形式,关系代词that作其宾语；
it指air.
先行词被the same修饰时,定语从句的关系代词可以用as也可以用that引导.但是意思有区别.
例如：Your shirt is the same as mine.你的衬衫和我的一样.
This is the same pen as I lost yesterday.这和我昨天丢失的笔是同一支.
We realize that air does not contain the same elements that
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