Mass Extinction

How many mass extinctions have there been? Was earth the only planet effected? Did the rest of our solar system have a mass extinction? All we know for sure is that it happens! We are living and dieing on this planet just as those before us did...I have yet to see a human skeleton imbedded in rock!.,like the dinosaur fossils!..oh yea, where is the NEW petroleum and where did so much of the old come from?