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JARDIM DO MAR - EROSÃO MARINHA

A cache by André&Paulo Send Message to Owner Message this owner
Hidden : 1/21/2015
Difficulty:
1.5 out of 5
Terrain:
2.5 out of 5

Size: Size: other (other)

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Geocache Description:



JARDIM DO MAR - EROSÃO MARINHA

Erosão marinha ou abrasão marinha é a erosão provocada pela ação das águas do mar. Elas atuam sobre os materiais do litoral (linha de costa) desgastando-os através da sua ação química e da sua ação mecânica. O aspecto da linha de costa é variável de acordo com a natureza dos materiais rochosos que a constituem. De um modo em geral podemos detectar dois tipos de costa:

  • a costa de arriba - de natureza alta e escarpada
  • a costa de praia - baixa e arenosa.

A água do mar reage quimicamente com alguns materiais rochosos desgastando-os. A ação mecânica das águas faz-se sentir quando o mar atira contra a costa rochas de dimensões variáveis originando fraturas nas rochas do litoral.

A ação que o mar exerce sobre os continentes faz-se sentir aos seguintes níveis desgaste, transporte e deposição. A ação de desgaste está condicionada pelos seguintes fatores:

  • reações químicas entre a água e os materiais;
  • ação mecânica da água;
  • força e direção das rochas;
  • natureza das rochas - dureza, constituição química e coesão.

O desgaste origina materiais soltos, de dimensões muito variáveis que as correntes marítimas transportam, por vezes, a grandes distâncias. Quando a velocidade e força das correntes diminuem os materiais transportados são depositados.

Marine erosion is the erosion caused by the action of the sea. They act on materials coastal (shoreline) wearing them through its chemical action and a mechanical action. The appearance of the shoreline varies according to the nature of rocky materials contained therein. In a manner generally we can detect two types of coast: 

  • the cliff coast - high nature and rugged
  • beach coast - low and sandy.

 

The seawater reacts chemically with some rocky materials wearing them. The mechanical action of water is felt when the sea throws against the shore rocks of variable size resulting in fractures in the coastal rocks.

The action that the sea has on the continent is felt to wear these levels, transport and deposition. The wear action is conditioned by the following factors:

  • chemical reactions between the water and the materials;
  • mechanical action of water;
  • strength and direction of the rocks;
  • nature of the rocks - hardness, chemical composition and cohesion.

The wear originates loose materials of very variable dimensions sea currents carry sometimes over great distances. When the speed and force of currents decrease the materials transported are deposited.


This page was generated by Geocaching Portugal Listing Generator
A EARTHCACHE

Para poderem loggar esta earthcache devem:

- Dirigir se ao local e enviar me por mail as respostas ás seguintes perguntas:

 •Que tipo de material resultou da erosão?

 •Qual o tamanho médio do material?

In order to log this eartcache, you should:

- Go to the coordinates and send me by mail, the answers to the following questions::

 •What type of material resulted from the sea erosion?

 •What is the average size of the material?

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Coordinates are in the WGS84 datum

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