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la tierra

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by

rocio romero estara

on 3 May 2010

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Transcript of la tierra

LA TIERRA, UN PLANETA HABITADO
¿Por que existe vida en la tierra? 1.la distancia que separa la Tierra del sol
2.las caracteristicas de sus movimientos de translacion y rotacion
3.recibe luz y calor suficiente para mantener la temperatura adecuada para las condiciones de vida 4.la masa y la gravedad
de la tierra
5.una capa gaseosa
(atmosfera) que por una parte,
protege al planeta de los rayos
ultravioletas e infrarrojas del sol
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