GENERATION OF EARTH'S MAGNETIC FIELD

AN ELECTRIC CURRENT - A FLOW OF CHARGED PARTICLES -

OCCURS WHEN A CONDUCTOR (A MATERIAL THROUGH WHICH CHARGES CAN EASILY FLOW) IS MOVED THROUGH A MAGNETIC FIELD

 

THE FIELD CAN BE FROM A PERMANENT MAGNET OR AN ELECTROMAGNET - IN WHICH THE CURRENT GENERATES THE REQUIRED MAGNETIC FIELD BECAUSE MOVING CHARGES CAUSE MAGNETIC FIELDS

BY THIS PROCESS MECHANICAL ENERGY OF MOTION PRODUCES AN ELECTRIC CURRENT

THIS SYSTEM - CALLED A DYNAMO - IS HOW POWER PLANTS (OIL, GAS, COAL, NUCLEAR, HYDRO) WORK

IN THE EARTH THE MOTION IS THAT OF HOT CONVECTING IRON IN THE OUTER CORE - THIS ENERGY COMES FROM:

- SINKING OF DENSE SOLID MATERIAL AS INNER CORE FREEZES FROM OUTER CORE

- RELEASE OF ENERGY AS MATERIAL FREEZES

-INITIAL HEAT LEFT OVER FROM EARLY HOT EARTH