What is the lava flow?
lava flow is the result of volcanic eruption caused by the rise of magma to the earth's surface. Magma is called lava after emerging from the Earth's crust. The active flow can exceed 1,300 ° F (700 ° C) and is highly destructive. Damage to property from this natural phenomenon is not unusual because the lava burns or puts away everything in the way. However, humans and animals can usually escape because lava moves at slow speeds.
Magma is a molten rock that circulates below the earth's surface. It is usually under high pressure and sometimes open or explodes volcanoes and causes active flows. As Magma travels, it collects particles of other rocks that affect its composition and subsequent efficiency. Because the magma is less dense than the rock, it slowly rises up the ground and causes the formation of magmatic chambers and lava dome. Magma and the resulting lava come in three basic types: Mafic, Central Afelsic.
Mafical lava flow tends to be softer than some other forms, because its primary component is more basalt than more explosive silicates. This type also tends to have lower viscosity - as a result they are thin and spread very evenly. Most often they occur in the neighborhood of the sea environment or around subduction zones of ocean plates, and most lava pillows are formed from this type of flow. The lava pillow is formed when lava appears underwater and creates immediate bark, which later bursts with a new lava, resulting in creating many small bulbs that resemble pillows.
temporary or Aditte lava flow has a higher amount of silica oxide and often occurs near the boundary of the plate. It is much more explosive, due to the higher percentage of silicates associated with them. The active flow tends to have a very liquid form and the appearances of unique crystals called phenocrystates inside the lava are not unusual.
Felsic lava flows are highly viscousand extremely explosive. This type usually occurs when the hot spot in the continental bark explodes, they carry particles and silicates to the surface with it. Felsic lava tends to be better than other types and often contains aluminum, potassium, sodium and calcium and form feldspar and quartz.
In addition to the lava pillows, lava can also take the form of a'a , a rough type of cinders characterized by pieces of material forming at the top. The a'a flow is easily visible by a radar satellite because its rough surface is well reflected. Walking to chilled lava a'a is demanding due to a rough and broken surface, while walking on a hot flow is generally not recommended.
Lava can also occur in the form of Pahoehoe, a smoothly emerged basalt lava. Pahoehoe often forms very strange, undulating shapes as it flows, and creates small lobes that push Lavspol. The lava rarely takes the form of sheet metal flow in which the upper and hips cool down and form a bark under which the hot lava still moves, eventually breaks the sides and createsVery rough edge.
deaths associated with lava flows are rarely connected directly to the lava itself. People die from the reaction of lava and water, from toxic gases that accompany the flows, and from other related events. If the lava is approaching, people should evacuate quickly and easily and make sure they take pets with them. If it is time, the evacuated should also remove important property, as their homes can be buried in several feet of black rock. Authorities advise when it is safe to return.