teoria wegener
TRANSCRIPT
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WEGENER: Los continentes en movimiento.
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• Ideas fundamentales hipótesis deriva Continental:
• -Hace 200m de a. todos los continentes estaban unidos formando uno solo denominado Pangea, que se fue fragmentando y desplazando lentamente hasta alcanzar la posición actual.
• -El motor responsable sería la inercia del movimiento de rotación de la Tierra y que los continentes, menos densos (SIAL), se deslizaban sobre el fondo oceánico más denso (SIMA).
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• -Geográficas: se basan en que las costas de los continentes, especialmente Sudamérica y África, encajan que como las piezas de un puzzles, esto es lógico si en el pasado estos continentes estuvieron unidos.
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• Pruebas geológicas y tectónicas :Se observa coincidencia y continuidad física de tipos de rocas, cronología de la misma y cadenas montañosas.
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-Paleoclimáticas: se basan en el hecho de que zonas que actualmente tienen un clima cálido (India y Australia) estuvieron en el pasado cubiertas por el hielo, mientras que zonas que hoy tienen un clima frío, norte de Europa y de América, en esa época eran bosque cálidos. Esto sólo puede explicarse si consideramos que dichas zonas ocuparon latitudes diferentes a las actuales.
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• Paleontológicas: se basan en la existencia del mismo tipo de fósiles en lugares que hoy se encuentran a miles de km de distancia (Sudamérica y África, India y Australia). Los estudios demuestran que estos organismos prehistóricos no fueron capaces de cruzar los océanos que hoy separan esos continentes, luego su existencia indica que dichos continentes estuvieron unidos en el pasado.
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• separacion de placas• Pangea• fondo oceánico• Pluma térmica• Bordes de placa• Litosfera, dorsal• Convección• Convección2
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