ecosistemul marea neagra
TRANSCRIPT
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Azi e miercuri 12 aprilie 2023
Acum este ora 12:39.
Relaxează-te un moment şi apreciază …
Derulare automată
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Substratul
-Alcătuit din nisip şi mâl
- coboară în pantă lină până la 180 – 200 m – platforma continentală
( zona litorală )-până la 1.800 m urmează o pantă abruptă
( zona abisală )
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Lumina
Pătrunde până la adâncimea de 200 m .
Temperatura apei
La suprafaţă variază în funcţie de anotimp
( vara : 20 – 25 grade Celsius )
( iarna : - 1 grade Celsius )
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Salinitatea în zona pelagică ( la suprafaţă, în largul mării ) este redusă : 7 – 12 %
Salinitatea în zona abisală ( sub 200 m adâncime ) este mai mare : 17 – 12 %
Lipsa curenţilor verticali la adâncimi mari face ca apele să nu se mai amestece.
Salinitatea Mării Negre este scăzută datorită aportului apelor continentale şi
comunicării reduse cu
Marea Mediterană.
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Mişcarea apei
-Curenţii verticali amestecă apa până la adâncimea de 200 m
- curenţii orizontali permit schimbul de apă cu Marea Mediterană
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Cantitatea de oxigen
Stratul superficial este bogat în oxigen.
Sub 200 m adâncime apa nu conţine oxigen.
În profunzime apa conţine hidrogen sulfurat, provenit din activitatea bacteriilor sulfuroase.
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Proiect realizat de profesor
Stupineanu Valentina
Şcoala nr. 12 Tulcea
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