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Dolines


     Nèlida Bernal Raspall
Què són?




Les Dolines, són depressions de
terreny a la superfície terrestre.
Causades per aigua que s’acumula i
no es absorbida.
Com es formen?


                                          Al ploure...




Quan un terreny es impermeable, és a
dir que no permet absorbir l’aigua, al
ploure, l’aigua, es va acumulant, fins
que aquesta, aconsegueix trencar la                      Al penetrar l’aigua
capa freàtica de la terra, i cau més
avall. Al passar això, queda una
depressió en el terreny, aquesta, es la
que anomenem Dolina.
Noves Formacions
Això, provoca la creació de
noves estructures
subterrànies, com                                     Estalactites:
l’estalactita, l’estalagmita i les                    Estructures que
columnes.                                             baixen del
                                                      sostre, formades
                                                      per carbonat càlcic.



                                         Columnes:
                                         Quan les estalactites, i les
                                         estalagmites s’ajunten, es formen
                                         columnes, perquè tot està compost
                                         de carbonat càlcic.
Estalagmites:
                                         Les gotes d’aigua que cauen de
Estructures que pujen
                                         l’estalactita, s’evaporen, quedant
del sòl, formades per
                                         sedimentat sota seu, el carbonat
carbonat càlcic.
                                         càlcic, que formarà l’estalagmita.
Fi

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Dolines

  • 1. Dolines Nèlida Bernal Raspall
  • 2. Què són? Les Dolines, són depressions de terreny a la superfície terrestre. Causades per aigua que s’acumula i no es absorbida.
  • 3. Com es formen? Al ploure... Quan un terreny es impermeable, és a dir que no permet absorbir l’aigua, al ploure, l’aigua, es va acumulant, fins que aquesta, aconsegueix trencar la Al penetrar l’aigua capa freàtica de la terra, i cau més avall. Al passar això, queda una depressió en el terreny, aquesta, es la que anomenem Dolina.
  • 4. Noves Formacions Això, provoca la creació de noves estructures subterrànies, com Estalactites: l’estalactita, l’estalagmita i les Estructures que columnes. baixen del sostre, formades per carbonat càlcic. Columnes: Quan les estalactites, i les estalagmites s’ajunten, es formen columnes, perquè tot està compost de carbonat càlcic. Estalagmites: Les gotes d’aigua que cauen de Estructures que pujen l’estalactita, s’evaporen, quedant del sòl, formades per sedimentat sota seu, el carbonat carbonat càlcic. càlcic, que formarà l’estalagmita.
  • 5. Fi