Reason for ranks decrease in google
 

Can anybody tell me reason for decrease in ranks for keywords in google but my alexa rank improved.

It's due to bad content or backlinks

bad contents are the main reason

Incorrect robots.txt integration, low quality content, no internal linking etc. may be the reasons for low website ranking.

Black Hat Techniques leads to decrease in rankings and their are many factors which lead to that

BackLinks will Cause Ranking Decreases, Content is the Other factor,