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Lava is molten rock expelled by a volcano during eruption.

This molten rock is formed in the interior of some planets, including Earth, and some of their satellites.

When first erupted from a volcanic vent, lava is a liquid at temperatures from 700 °C to 1,200 °C (1,300 °F to 2,200 °F).

Although lava is quite viscous, with about 100,000 times the viscosity of water, it can flow great distances before cooling and solidifying, because of both its thixotropic and shear thinning properties

A lava flow is a moving outpouring of lava, which is created during a non-explosive effusive eruption. When it has stopped moving, lava solidifies to form igneous rock. The term lava flow is commonly shortened to lava.

Explosive eruptions produce a mixture of volcanic ash and other fragments called tephra, rather than lava flows. The word "lava" comes from Italian, and is probably derived from the Latin word labes which means a fall or slide.

The first use in connection with extruded magma (molten rock below the Earth's surface) was apparently in a short account written by Francesco Serao on the eruption of Vesuvius between May 14 and June 4, 1737.

Serao described "a flow of fiery lava" as an analogy to the flow of water and mud down the flanks of the volcano following heavy rain.

The viscosity of lava is important because it determines how the lava will behave. Lavas with high viscosity are rhyolite, dacite, andesite and trachyte, with cooled basaltic lava also quite viscous; those with low viscosities are freshly erupted basalt, carbonatite and occasionally andesite.

Highly viscous lava shows the following behaviors:

tends to flow slowly, clog, and form semi-solid blocks which resist flow

tends to entrap gas, which form vesicles (bubbles) within the rock as they rise to the surface

correlateswith explosive or phreatic eruptions and is associated with tuff and pyroclastic flows

Highly viscous lavas do not usually flow as liquid, and usually form explosive fragmental ash or tephra deposits. However, a degassed viscous lava, or one which erupts somewhat hotter than usual, may form a lava flow.

Lava with low viscosity shows the following behaviors:

tends to flow easily, forming puddles, channels, and rivers of molten rock

tends to easily release bubbling gases as they are formed

eruptions are rarely pyroclastic and are usually quiescent

volcanoes tend to form broad shields rather than steep cones

Lavas also may contain many other components, sometimes including solid crystals of various minerals, fragments of exotic rocks known as xenoliths and fragments of previously solidified lava.

Lava flows are enormously destructive to property in their path but generally move slowly enough for people to get out of their way, though this is dependent on the viscosity of the lava; casualties caused directly by active lava flows are rare.

Nevertheless injuries and deaths have occurred, either because people had their escape route cut off, because they got too close to the flow or, more rarely, if the lava flow front travelled too quickly.

This notably happened during the eruption of Nyiragongo in Zaire (now Democratic Republic of Congo) on 10 January 1977 when the crater wall was breached during the night and the fluid lava lake in it drained out in less than an hour.

Flowing down the steep slopes of the volcano at up to 100 km/h, the lava swiftly overwhelmed several villages whilst their residents were asleep. As a result of this disaster, the mountain was designated a Decade Volcano in 1991.

Deaths attributed to volcanoes frequently have a different cause, for example volcanic ejecta, pyroclastic flow from a collapsing lava dome, lahars, poisonous gases that travel ahead of lava, or explosions caused when the flow comes into contact with water.

I'll do this in steps so it's easy to follow each part. It's not really difficult, just long. You can add the whole numbers and the fractions together seperately. i.e. 5 + 3 + 1/2 + 3/5 So you can add 5 + 3 = 8 and then add the fractions seperately. (1) Before you can add fractions, they must have the same denominator (bottom). So you have to convert both fractions to equivalent fractions with a common denominator. (a) First find a number which is a multiple of both denominators.. Easiest way to do this is just to multiply them together. i.e. 2 x 5 = 10 - use 10 as a common denominator. (b) Now you have to multiply the numerators (top) of each fraction by the number you multiplied each denominator by to get the common denomiator. You need to do this to keep the fractions equivalent (equal) to what they were with the old denominators. (Equivalent fractions are made by multiplying top and bottom by the same number - to keep them equal to the original.) For 1/2: 2 x 5 = 10, so multiply numerator (1) by 5. Now 1/2 becomes 5/10 (i.e. multiply both top and bottom by 5) For 3/5: 5 x 2 = 10 => 3 x 2 = 6 => 3/5 = 6/10 (i.e. multiply both top and bottim by 2) (2) Now you can add the fractions together. You do this by adding the numerators (tops) and leaving the denominator the same: 1/2 + 3/5 = 5/10 + 6/10 = (5 + 6)/10 = 11/10 (i.e. 5 tenths + 6 tenths = 11 tenths) This is an improper fraction (bottom bigger than top), so convert it to a mixed number (whole number with fraction). Do this by dividing top by bottom and leaving the remainder in the fraction part: 11/10 = 1 1/10 (3) Now add this "mixed number" to the original whole number parts: 5 1/2 + 3 3/5 = 5 + 3 + 1/2 + 3/5 = 5 + 3 + 1 1/10 = 9 1/10

Lava has different properties. The viscosity of lava depends on its mineral content. More silica results in a very thick, slow-flowing, and very explosive lava. Less silica results in a thin, watery, and quiet eruption lava.

3 ways to block it:

1. Lava barricades (usually made of extremely hard stone)

2.Trenches(so it pours into them instead of going further down a mountain

3. Chutes down a mountain (to make lava go in a wanted path usually towards an ocean)

Lava is the wat it is because of what it is made up of. It is severely heated up rocks to the point that it turns into a liquid. Its hard to cool down and is usually really dense. It is more of a gel than a liquid. The lava is usually heated from the thermal layers in the earth which make steam heating up the rock in a volcano. Once a certain pressure is reached, it erupts.

Interesting fact: most of the hawaiian islands are made of dried lave from past eruptions because once it cools down it dries back in to a rock state.

Have you tried going to an art store or a science store to see what they carry?