medii tropical uscate
TRANSCRIPT
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Medii tropical-uscate
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Pozitie geografica
Localizare: 15˚-30˚ lat. : N Africii (Sahara), Pen. Arabia, Irak, Iran, Pakistan, India, Pod. Mexican, S Africii (Kalahari), America de S (Atacama), centrul si E Australiei
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Clima
-vanturile:alizee(tot timpul anului);
-Temperatura 25°-30°C;
-sezonul de vara-temperaturi 50°C;
-in Sahara temperatura maxima absoluta a fost de 58,5°C;
-Variatia diurna a temperaturi este foarte mare pana la temperaturi
negative(din acest motiv dezagregarea rocilor este extrem de accelerata);
Precipitatiile sunt rare si neregulate(pot fi de 5mm/an);
-Obsevartie:- in semipustiuri cantitatea de precipitatii variaza intre 50-150mm/an;
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Zonele de clima tropical-uscata
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Vegetatie
Vegetatia-adaptata la conditiile de ariditate : ierburi xerofile(iubitoare de uscat)si ierburi halofile(care traiesc pe soluri cu saruri);
-ex:cactusi, agave , acacia , baobab,palmier,etc.
-vegetatia cantonata in ueduri si oaze unde se intalnesc palmieri.
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Cactus
Ierburi xerofile
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Duna de nisip
Acacia
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Fauna Serpi,insecte,scorpioni,camila,dromader(Sahara),sacali, hiene,vulpi de desert, etc. Spre margini patrund uneori animale de savana.
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Tipuri de peisaje
- Deserturi – precipitatii rare, sub 150 mm pe an, averse, exista ani fara ploi; mase de nisip, campuri de pietre, cruste de saruri, vegetatie saraca;
- Semideserturi – precipitatii 300-350 mm, cad regulat; ierburi, arbusti; brusa cu acacii (N Saharei), brusa cu cactee (Mexic), caatinga (Brazilia);
- muntii – versanti dezgoliti, cu mase de grohotis (amplitudini mari de t˚ - ridicate ziua, negative noaptea);
- oazele – panza de apa subterana este la adancime mica; favorabile asezarilor umane; culturi de curmali, leandri, arbori de fistic; antropizari in zonele cu exploatari de petrol si gaze.
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Semi-desert
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Soluri si relief Solul este subtire si se dezvolta in sezonul ploios . Depresiuni largi de oaze, câmpii acoperite cu nisip, platouri,
munţi, straturi de nisip, dune şi erguri (mări de nisip) Peste 25% din suprafata Saharei este acoperită de straturi de
nisip şi dune.
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• Proiect realizat de elevii clasei a IX-a MI:
Antonache Florentina Aurora
Catalin George Claudiu
Cioceanu Ana-Marieta
Ionita Diana Alexandra
Tudor Ionela Florentina
Profesor coordonator : Sterienescu Lidia
Grup Scolar Alexandru Odobescu