Reconstitution des phénomènes passés


Quels sont les différents types d'indices géologiques qui permettent de reconstituer les climats du passé ?

Au cours des temps géologiques et notamment depuis l'explosion de la vie il y a -540 millions d'années, de nombreux indices géologiques, paléontologiques et écologiques permettent aux scientifiques de reconstituer les climats du passé, appelés les paléoclimats.

Quels sont les phénomènes qui provoquent l'entrée ou la sortie de la glaciation ?

Cependant, ils ne suffisent pas à provoquer l'entrée ou la sortie de glaciation. Ce sont les phénomènes de rétroaction, albédo et effet de serre qui amplifient les variations et provoquent les alternances de périodes glaciaires et interglaciaires. Il existe d'autres boucles de rétroaction initiées par d'autres surfaces, telles que le permafrost.

Pourquoi le présent nous renseigne-t-il sur le passé ?

En considérant que ces phénomènes se déroulaient de la même façon dans le passé, ils se représentent l'environnement passé : c’est le principe de l’ actualisme. Ainsi, le présent nous renseigne sur le passé. 2. Reconstitution d'un paysage ancien Dans le Perche, en Basse-Normandie, on peut facilement ramasser du sable.

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Reconstitution d’un paysage du passé : exemple du Perche Rédiger et gérer son temps Rédiger la solution d’un problème Rédiger un paragraphe argumenté Rédiger une biographie Rédiger une fiche de lecture Rédiger une réponse aux questions du brevet Réduction des effets néfastes des aménagements urbains

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