adsense question?adsense users plz help

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i want to ask the adsense users that what is the difference b/w page impressions & clicks.tell me the total procedure that how do we get paid.does google pay for every click on ads.i mean if someone clicks on an ad continously forsometime.do we get paid for every click? i want to ask about adsense search-what is the difference b/w queries & clicks.when it is searched.what are termed as clicks & what are cliks. i m having 500 queries but 7 clicks.how it happened?