DEPTH & HEAT FLOW VS AGE

COOLING OF OCEANIC LITHOSPHERE AS IT MOVES AWAY FROM THE RIDGE CAUSES ROCK TO CONTRACT AND BECOME DENSER

 

HEAT FLOW THROUGH THE SEA FLOOR DECREASES WITH THE SQUARE ROOT OF AGE

 

BY ISOSTASY, OCEAN DEPTH INCREASES WITH THE SQUARE ROOT OF AGE, AND THEN LEVELS OFF DUE TO THE FACT THAT THE PLATE IS NO LONGER COOLING

 

THE COOLING PLATES BECOMING DENSER WITH AGE CAUSE THE "RIDGE PUSH" FORCE - ONE OF THE FORCES DRIVING PLATE MOTIONS

(Davidson)