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1r eso tema 2 esquemes

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esquemes

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1r eso tema 2 esquemes

  1. 1. 3. Els agents EXTERNS de FORMACIÓ DEL RELLEU  AGENTS EXTERNS TOTS ELLS MODIFIQUEN EL RELLEU i TENDEIXEN a IGUALAR-LO  FORMES: 1. AIGUA: ES el PRINCIPAL AGENT EXTERN MODELADOR DEL RELLEU  FORMES EN QUE ACTUA:  PLUJA:  DESGASTA MUNTANYES, OBRI BARRANCS I VALLS, FORMA PLANÚRIES i DELTES  NEU:  S’ACUMULA A LES MUNTANYES i pel SEU PES DESPLAÇA ROQUES i TERRES i FORMA VALLS GLACIALS  AIGUA GELADA, per BAIXES TEMPERATURES:  S’INTRODUEIX A LES FISURES DE LES ROQUES i AUGMENTA EL VOLUM TRENCANT LES ROQUES  REACCIÓ QUÍMICA:  ALGUNS COMPONENTS DE LES ROQUES PROVOCARAN LA SEUA DISSOLUCIÓ i la FORMACIÓ DE COVES, GALERIES i RIUS D’AIGUA SUBTERRÀNIA  AIGUA DEL MAR:  EN FORMA D’ONADES, CORRENTS MARINES i MAREES, ACTUA SOBRE EL LITORAL DESGASTANT LES ROQUES i ACUMULANT ARENES EN PLATGES i GOLFS 2. VENT:  DESGASTA LES ROQUES, TRANSPORTA PARTÍCULES XICOTETES i EROSIONA LES ROQUES  ES MOLT MÉS EFICAÇ LE SEUA EROSIÓ SI COINCIDEIXEN SEQUETAT i FALTA DE VEGETACIÓ 3. VEGETACIÓ:  ARRELS de PLANTES i ARBRES PENETREN en els SÒLS TRENCANT LES ROQUES PERÒ TAMBÉ FIXEN els SÒLS dels VESSANTS i les PROTEGEIXEN de l’EROSIÓ 4. L’ÉSSER HUMÀ:  ELS PROGRESSOS TECNOLOGICS FAN QUE TRANSFORME EL TERRITORI D’UNA MANERA INTENSA i RÀPIDA  FORMES EN QUE EL TRANSFORMA:  CONTINUA OCUPACIÓ i URBANITZACIÓ DEL SÒL  CONSTRUCCIÓ DE GRANS INFRAESTRUCTURES i EQUIPAMENTS, COM SÓN: VIES DE COMUNICACIÓ. EMBASSAMENTS, PORTS etc.  EXPLOTACIÓ DE RECURSOS NATURALS, COM SÓN LES: MINES, PEDRERES, TALA DE BOSCOS, etc.

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