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Histoires de Météorites
Volume I - Ensisheim

 
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  Bolide 25 janvier 2008
 
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Bensour, Meteoryt Mag.
PDF file (512Ko) in Polish

 

Mazapil, Astronomie Mag.
PDF file (1.4Mo) in French

 
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Sahara, the biggest and the most famous desert of the world, covers 8,5 millions of km2. From the Atlantic Ocean to the Red Sea, Sahara crosses ten countries of the North of Africa: Morocco, Algeria, Libya, Egypt, Tunisia, Mauritania, Mali, Niger, Chad and Sudan.

The history of Sahara begins more than 400 million years ago while, as Antarctica, it occupied the South Pole of the Earth and looked like an inlandsis. Sahara was then immersed during dozens million years in the southern hemisphere, then appeared at the level of the equator before stopping at the level of the tropic of Cancer.

Climate change modified the landscape of Sahara in the course of time. By alternation, the variations of climate produced wet periods and dry periods. The last phase of land draining began approximately 3000 years ago, the desert environment of Sahara as we know it now date about 1000 years. The erg of Mourzouk in Libya detains the world record of heat: 58°C in the shade on September 13th, 1922.

Le Sahara, le plus grand et le plus célèbre désert du monde, couvre 8,5 millions de km2. De l'Atlantique à la mer Rouge, le Sahara traverse dix pays du nord de l'Afrique : Maroc, Algérie, Libye, Egypte, Tunisie, Mauritanie, Mali, Niger, Tchad et Soudan.

L'histoire du Sahara commence il y a plus de 400 millions d'années alors que, comme l'Antarctique, il occupait le pôle Sud de la Terre et ressemblait à un inlandsis. Le Sahara a ensuite été immergé pendant des dizaines de millions d'années dans l'hémisphère Sud, puis a émergé au niveau de l'équateur avant de s'immobiliser au niveau du tropique du Cancer.

Les changements climatiques ont modifié le paysage du Sahara au fil du temps. Par alternance, les variations de climat produisirent des périodes humides et des périodes sèches. La dernière phase d'assèchement a commencé il y a environ 3000 ans, l'environnement désertique du Sahara comme nous le connaissons actuellement date d'environ 1000 ans. L'erg de Mourzouk en Libye détient le record mondial de chaleur : 58°C à l'ombre le 13 septembre 1922.

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© Ph. Thomas (click to enlarge)


© Ph. Thomas (click to enlarge)


© Ph. Thomas (click to enlarge)


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© Ph. Thomas (click to enlarge)

   Landscape


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   Animals & vegetation


© Ph. Thomas (click to enlarge)


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© Ph. Thomas (click to enlarge)


© Ph. Thomas (click to enlarge)

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