Earth’s magnetic field and its strange nature.  

EARTH’S MAGNETIC FIELD AND ITS STRANGE NATURE.  DESCRIBE HOW AND WHY THE EARTH’S MAGNETIC FIELD FLIPS. WHY IS THE EARTH’S MAGNETIC FIELD SO IMPORTANT TO HUMAN SURVIVAL?  WHAT EVIDENCE SUPPORTS THE EXISTENCE OF MAGNETIC REVERSALS? WHAT ARE THE CONSEQUENCES OF EARTH’S MAGNETIC FIELD REVERSAL?