EARTH DIFFERENTIATES

- EARLY EARTH UNIFORM (HOMOGENEOUS ; "homogenized

milk" )

- PLANET HEATS UP

- DENSE IRON CORE SINKS, LEAVING LAYERED PLANET:

LIGHT CRUST ON TOP , CORE BELOW, AND MANTLE IN BETWEEN

- DIFFERENTIATION CONTINUES TODAY AS PLANET COOLS

BY THERMAL CONVECTION - PLATE TECTONICS

-HENCE EARTH'S EVOLUTION IS CONTROLLED BY ITS

THERMAL HISTORY- TEMPERATURE AS A FUNCTION OF

DEPTH AND TIME ("HEAT IS THE GEOLOGICAL

LIFEBLOOD OF PLANETS")

 

 

 

 

 

(Press & Siever)