Wheybolic Amplified 60

d) Classification of lavas (per flow)

LAVAS FLOW TO YOUR
According to the morphology and internal structure of lava flows are divided into two groups: the cast aa and pahoehoe type, both names come from the native language of the island of Hawaii.
The pahoehoe and aa lavas can coexist in the same heat, where the movement of the lava has different ways due to differences in the speed and flow.

Lavas Pahoehoe

Pahoehoe Hawaiian name meaning "soft" (because it uses a type of surface where you can walk without difficulty) as this on cooling has a smooth crust.
is common in this type of lava formation of surface roughness, as the crust still plastic mass is carried by liquid flowing under the surface (lavas strings, gut wash, etc.).
Such lavas are mostly trying to wash basalts. This is at a high temperature, the gases escape slowly and gently stream solidifies.
As sauperficie lava crystallizes faster than the inside, preventing the passage of gases to the surface, so that holes are called hobs.
The lavas pahoehoe tienen una morfología diferente a la de las lavas aa, lo cual se debe a que se desplazan con menor velocidad que las lavas aa.

Lavas AA

      Las lavas AA provienen del hawaiano que significa "pedregosa con lava áspera", tienen un significado opuesto a pahoehoe, define las coladas de superficie áspera y rota, difícilmente transitable, que también se conocen con el nombre castellano de malpaís.
      Las aa lava types are formed at the top of loose blocks. The ridges are composed of blocks, bombs and scoria material cemented by the lava. This is the result of a violent expulsion of gases to be separated from the lava and pressure inside the still fluid lava has on the surface and solidified.

type Aa lavas are generally more viscous than pahoehoe type, although the pahoehoe lava may become

Aa

TRANSITION

pahoehoe lava A AA

During the cooling lava, there is a freeing, successive polymerization and crystallization, which results in a change in propiedadesreólogicas reflected in variations of parameters such as viscosity and threshold. Arguably
pahoehoe to aa step is performed only when certain flow parameters (flow and slope, mainly) make continuous casting move, although it has cooled to critic of viscosity grade. If this viscocidadcrítica is reached when the melt is backwater and is practically immobile, the surface will keep caracterícticas pahoehoe lava degassing and crystallization culminating in sleep.

pillow lavas (pillow lavas)

When the lava comes into contact with water forms a thin glass layer, yet plastic material enclosing the molten magma to continue to flow as identified on the front and the melt surface protuberances or pouches separate and roll down the coastal slope or the gentle slopes of submarine pyroclastic buildings.
These bags or pads, pillows, accumulate at the foot of the slope deposits with a typical arrangement, pillow lavas and pillow lavas "Each pillow has a convex top surface, while the base is pointed or keel-shaped to fit over the previously deposited paved with pillows.
If the rash is fast, the base of these deposits does not exhibit this character or consists of elongated pillows and crushed by the accumulated weight on them. Other pads are isolated and retained spherical shapes, to be covered by pyroclastic mass or products from the decomposition of the vitreous cortex. Cradle of pillows glass solidifies gradually inward in concentric layers, leaving a core that cools more slowly and is therefore more crystalline.
The last stage of solidification causes radial fractures appear typical retraction of the pillows.