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Copy 3-6 graphics and 2 pages of understandable information. from the internet.
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copy and paste info ..10
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Total points..............25
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lava volcanoes
lava volcanoes are like time bombs.They can erupt anytime. Most of the volcanoes are lava volcanoes. lava volcanoes are lava that is been pushed from the middle of the earth. The middle of the earth is mainly made of lava hot liquid rock. That volcanic rock liquid pushes its way out of the middle if the earth. lava volcanoes make big explosions and can make big clouds that could block the sun for weeks.Volcanoes block the sun when they erupt. most of the trees and wild life in the area get damage.
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In volcanology, a lava dome or volcanic dome is a roughly circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. The geochemistry of lava domes can vary from basalt to rhyolite although most preserved domes tend to have high silica content.[1] The characteristic dome shape is attributed to high viscosity that prevents the lava from flowing very far. This high viscosity can be obtained in two ways: by high levels of silica in the magma, or by degassing of fluid magma. Since viscous basaltic and andesitic domesweather fast and easily break apart by further input of fluid lava, most of the preserved domes have high silica content and consist of rhyolite or dacite.

Dome dynamics[edit]

Lava domes evolve unpredictably, due to non-linear dynamics caused by crystallization and outgassing of the highly viscous lava in the dome's conduit.[2] Domes undergo various processes such as growth, collapse, solidification and erosion.
Lava domes grow by endogenic dome growth or exogenic dome growth. The former implies dome interior expansion to accommodate new lava and the latter refers to superficial piling up of lava.[1] It is the high viscosity of the lava that prevents it from flowing far from the vent from which it extrudes, creating a dome-like shape of sticky lava that then cools slowly in situ. Domes may reach heights of several hundred meters, and can grow slowly and steadily for months (e.g. Unzen volcano), years (e.g. Soufrière Hills volcano), or even centuries (e.g. Mount Merapi volcano). The sides of these structures are composed of unstable rock debris. Due to the intermittent buildup of gas pressure, erupting domes can often experience episodes ofexplosive eruption over time. If part of a lava dome collapses while it is still molten, it can produce pyroclastic flows,[3] one of the most lethal forms of volcanic event. Other hazards associated with lava domes are the destruction of property, forest fires, and lahars triggered by pyroclastic flows near mud, snow and ice. Lava domes are one of the principal structural features of many stratovolcanoes worldwide. Lava domes are prone to unusually dangerous explosions since they contain rhyolitic silica-rich lava.
external image 250px-MSH80_bulge_on_north_side_04-27-80.jpg

Photo showing the bulging cryptodome of Mt. St. Helens on April 27, 1980.

Characteristics of lava dome eruptions include shallow, long-period and hybrid seismicity, which is attributed to excess fluid pressures in the contributing vent chamber. Other characteristics of lava domes include their hemispherical dome shape, cycles of dome growth over long periods, and sudden onsets of violent explosive activity.[4] The average rate of dome growth may be used as a rough indicator of magma supply, but it shows no systematic relationship to the timing or characteristics of lava dome explosions.[5]