la vida cotidiana

Los viajes de exploracion ,causas, expediciones españolas-los viajes menores-consecuencias de los viajes de exploracion

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lllllllllllllllllllllllllllllllllllllllllllllllllllHace 225 millones de años, aún existía un único continente denominado Pangea. Hoy en día, Pangea se ha fragmentado, el agua ha invadido las zonas bajas y la apariencia de la Tierra havariado sustancialmente. Por supuesto, seguirá cambiando con el paso del tiempo.
Sin embargo, no ha sido fácil demostrar, que efectivamente las placas se están moviendo hoy en día, ya que el desplazamiento es muy lento y su medición muy complicada.
Sabemos que se ha producido en el pasado, porque de otro modo sería casi imposible explicar el por qué de la aparición de las montañas, la periódicaactividad de los volcanes, los mencionados terremotos, o justificar las razones por las que los fósiles de animales prehistóricos que vivían en una misma zona se encuentran ahora distribuidos a lo largo de diversos continentes, pero hemos tenido que esperar a la llegada de la era espacial para poder constatar que efectivamente aún existe una tectónica de placas.
Variaciones tan pequeñas puedenparecer casi anecdóticas y poco demostrativas de un movimiento tectónico, pero la realidad es que a escala geológica tienen mucha importancia.
Así, el ritmo de separación de 2 centímetros al año entre América del Norte y Europa coincide con un recorrido de 4.000 km en un plazo de 200 millones de años (fecha en la que aún estaban en contacto), exactamente la anchura actual del océano Atlántico....