jueves, 5 de marzo de 2009

Gif Letras, Numeros y Simbolos en Rombos

Vadose zone: The region in the ground between the surface and the water table in which pores are not filled with water. Also called the unsaturated zone.


Valence electron: An electron of the outermost shell of an atom; one of those most active in bonding.


Van der Waals bond: A bond much weaker than the ionic or covalent, which bonds atoms by small electrostatic attraction.


Varve: A thin layer of sediment grading upward from coarse to fine and light to dark, found in a lake bed and representing one year's deposition of glacial outwash.


Vector: A mathematical element that has a direction and magnitude, but no fixed position. Examples are force and gravity.


Ventifact: A rock that exhibits the effects of sand-blasting or "snowblasting" on its surfaces, which become fiat with sharp edges in between.


VERB:The part of speech that expresses existence, action, events and states.

Vertical exaggeration: The ratio of the horizontal scale (for example, 100,000: 1) to the vertical scale (for example, 500: 1) in an illustration.


Viscosity: A measure of resistance to flow in a liquid.


Volcanic ash: A volcanic sediment of rock fragments, usually glass, less than 4 millimeters in diameter that is formed when escaping gases force out a fine spray of magma.


Volcanic cone: The deposit of lava and pyroclastic materials that has settled close to the volcano's central vent.


Volcanic pipe: The vertical chamber along which magma and gas ascend to the surface; also, a formation of igneous rock that cooled in a pipe and remains after the erosion of the volcano.


Volcano: Any opening through the crust that has allowed magma to reach the surface, including the deposits immediately surrounding this vent.


V-shaped valley: A valley whose walls have a more-or-less uniform slope from top to bottom, usually formed by stream erosion.


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