Wednesday, August 3, 2011

Form Volcanoes


dome shape
1. The dome shape
Volcano has a convex upward morphology.
Lava dome is viscous molten lava that comes out through the gap and bounded by steep sides all around.

 
cone shape
maar shape
2. Cone shape
Is due to the piles of lava or explosive eruptions that didikuti with effusive (melt).
Most of the volcanoes in Indonesia conical.
Types of volcanic cone shape:
a. Cone spray
b. Cone parasites (parasitic cone)
c. Cinder cone (cinder cone)
d. Tuff cone and lump
3. The shield shape (shield)
The shape is like a shield volcano due to piles of lava from the eruption a few times. This volcano has a very broad base with a sloping slopes gunugn because formed from molten lava liquid.
4. Maar shape (funnel)
Characteristics:
a. This mountain resembles a funnel formed by the great eruption.
b. Eruption accompanied by intense bursts of gas.
c. Neck oval-shaped crater.
d. Like a bowl-shaped crater with a diameter of 3-4 km.
e. Terletakdi bottom of the crater below the soil surface.
f. Usually there is a crater lake.
5. Forms Barangko
Namely grooves on a rough volcanic and irregular due to erosion.
6. Needles volcano (Lava Spine)
Lava from the crater immediately frozen and stuffed pit crater that the longer protruding high above the crater.
7. Form of the plateau:
a. Lava plateau
Occurs due to eruption of calm in the form of molten lava through the cracks that form the lava plateau.
b. Pyroclastic plateau
Compiled by pumice and ash deposits are fired from the gap and has a caldera structure or subsidence curves.
8. Shape Strato (pyroclastic cone)

The volcano is layered with a rather steep slope consisting of an Intermittent sediment. The precipitate in the form of lava forming a layer of waterproof so there are lots of stored water that comes out to be a big spring.

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