Geografia continentelor extraeuropene. Caiet pentru clasa a VII-a. I. Marculet, M. Dumitrescu.pdf
Mişcarea continentelor
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Transcript of Mişcarea continentelor
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Alfred Wegener -1912- a existat un “supercontinent” (Pangea) care s-a divizat în continentele actuale. Teoria era confirmată de depozitele fosile şi glaciareWegener n-a reuşit să ofere un MECANISM pt. divizarea Pangeei
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Harry Hess - anii 1960 oferă mecanismul
Mişcarea plăcilor tectonice
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Cum construiesc modelele oamenii de ştiinţă?
Mâncând mulţi biscuiţi cu cremă...
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Plăci divergente - Creste OceaniceIslanda
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Islanda
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Placa Nord
Americană Placa
Pacifiă
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80 Milioane de ani
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80 Milioane de ani
45 Milioane de ani
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45 Milioane de ani
21 Milioane de ani
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21 Milioane de ani
Se formează astăzi
45 Milioane de ani
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4214 m
4168 m
Mauna Kea
Mauna Loa
HAWAI
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Mauna KeaHawaii
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Forţele care determină mişcarea plăcilor tectonice
• Coborârea biscuitului versus ridicarea cremei
• Ridicarea cremei - ridicarea magmei fierbinţi
• Coborârea biscuitului - gravitaţia coboară plăcile tectonice reci, dense înapoi în mantauă
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Verificarea mişcării plăcilor
• Terra are un câmp magnetic
• Acesta îşi schimbă direcţia la anumite intervale de timp (perioade geologice)
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-Magma conţine minerale magnetice
-Acestea se ordonează în sus sau în jos, în funcţie de sensul câmpului magneticterestru
- La răcirea magmei mineralele magneticeîngheaţă în sensul câmpului magnetic terestru din acea perioadă geologică
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Cunoscând vârsta geologică a rocilor de pe fundul oceanelor...
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Ultima inversarecu 200.000de ani în urmă
Codul de bare
Calibratprin datarea vârstei geologice a rocilor
…se poate determina deplasarea plăcilor tectonice
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Harta magnetică afundului oceanului Atlantic
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Harta magnetică afundului oceanului Pacific de Est