Geofisica
La geofisica es la sciéncia que s'encarga de l'estudi de la Tèrra dempuèi lo ponch de vista de la fisica. Lo sieu objècte d'estudi abasta totes los fenomèns ligats a l'estructura, de condicions fisicas e istòria evolutiva de la Tèrra. A l'èsser una disciplina experimentala, usa per lo sieu estudi metòdes quantitatius fisics coma la fisica de reflexion e refraccion d'ondas mecanicas, e una seria de metòdes basats en la mesura de la gravetat, de camps electromagnetics, magnetics o electrics e de fenomèns radiactius. En qualques cases diches de metòdes aprofièchan de camps o de fenomèns naturals (gravetat, magnetisme terrèstre, mareas, de tèrratrems, de tsunamis, etc) e en unes autres son indusits per l'òme (de camps electrics e de fenomèns sismics).
Dins la geofisica se distinguisson doas grandas brancas: La geofisica intèrna e la geofisica extèrna.
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