Alguien me puede explicar la diferencia tecnica-geologica entre tierra y arena?
Que caracteristicas las definen y diferencian entre si?
Lo pregunte en Yahoo respuestas, hace 2 días y obtuve 7 respuestas. Gracias, todas las respuestas aportaron algo, esta de geologo es la mas directa:
Tècnicamente la arena està compuesta por granos provenientes de la destrucciòn de rocas, su tamaño varìa entre 2mm y 1/16 mm, debajo de esto se hallan los limos. El tèrmino "tierra" no existe para designar a algùn material, informalmente se llama asì a un compuesto de limo-arena-arcilla, tambien se denomina lodo o barro si està humedo.
Mas en profundidad, editando las respuestas de todos:
Si pasas tierra por una serie de tamices, (están definidos por normas en la escala granulométrica ), vas obteniendo todos los componentes del suelo en lo que se refiere a tamaño de las partículas:
arcilla, limo, arena, ......., cantos rodados,cuyos porcentajes de cada uno de estos le darán su nombre en una clasificación unificada de suelos..
Cada tipo tiene características muy distintas, las arcillas poseen efectos de adsorción muy importantes para la retención de humedad, la arena facilita el flujo del agua en el suelo.
La materia que estudia este tema es la edafología.
La arena es producto de la erosion de rocas preexistentes donde prevalencen los materiales como ser: Cuarzo, muy redondeados en la mayoria de los casos, Micas blancas, clastitos de otras rocas, etc, la composicion depende del ambiente y grado de seleccion. Es un compuesto mineral viene dado en función de un tamaño de grano definido de sus partículas dentro de la clasificación unificada de suelos.
La tierra, supongo que te referias al suelo y no a el planeta tierra, el suelo es un sistema muy complejo cuya composicion varia de lugar en lugar y tiene que ver con el material que le dio origen, los factores climaticos y geograficos, etc. Es un compuesto orgánico.
Podes buscar informacion con respecto a las arenas en libros de sedimentologia y al suelo en libros de pedologia.
Gracias a:
Alex G
Henry N
Fotón
Luis Ernesto F
pame
jsanddnas... por haber resuelto la duda existencial de la semana.
5 Comments:
La arena está sobrevalorada.. salio en una peli.
Y ya.
No tengo nada inteligente que comentar.
Del iceman (hasta hueva me dio acceder)
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