Lava


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lava

(lä`və), molten rockrock,
aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.
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 that erupts on the earth's surface, either on land or under the ocean, by a volcanovolcano,
vents or fissures in the earth's crust through which gases, molten rock, or lava, and solid fragments are discharged. Their study is called volcanology. The term volcano
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 or through a fissure. It solidifies into igneous rock that is also called lava. Before reaching the earth's surface, the mixture of solid and liquid rock, and gases, is known as magma. Lavas are composed chiefly of silica and the oxides of aluminum, iron, magnesium, calcium, sodium, and potassium. Silica, with soda and potash, predominates in the light-colored, acid felsites; iron oxides, lime, and magnesia, in the dark-colored, basic basaltsbasalt
, fine-grained rock of volcanic origin, dark gray, dark green, brown, reddish, or black in color. Basalt is an igneous rock, i.e., one that has congealed from a molten state.
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. Rock froth forms on the upper part of a lava flow if bubbles solidify before the gas can escape. Light-colored, glassy froth is pumicepumice
, volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the general appearance of a rock froth.
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; dark, cindery or slaggy froth, of a coarser texture than pumice, forms what is known as scoriae. Lava flows which solidify as a mass of blocks and fragments with a rough surface are called block lava, or aa; those which solidify with a smooth, ropy, billowy surface are known as corded lava, or pahoehoe. Lava can sometimes cover wide regions through great fissures in the earth's surface, as in the ancient Columbia River plateau of the NW United States, where it is spread over 30,000 sq mi (77,700 sq km) and is up to 5,000 ft (1,524 m) deep. Other such regions are found in the Deccan plateau of India, in E Brazil, and in Iceland. Submarine lavas develop through volcanic activity along the mid-oceanic ridges and plate boundaries, where the mid-oceanic ridges produce more lava than any continental eruptions. Such underwater eruptions also harbor rich fauna unique to the vent area, such as red tube worms and giant clams, whose food supply is based on the hydrogen sulfide abundant in the vent waters. Unique features include black smokers, or hot springs of mineral-rich water that belch out from the ocean ridge where it is most active. In many instances the reasons for the heat and liquidity of magma, its exact source, and the causes of its rise in the earth are not clearly known, though the volcanic activity is often related to seafloor spreadingseafloor spreading,
theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges. First proposed in the early 1960s by the American geologist Harry H.
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. Other volcanic areas also lie along colliding plate boundaries and around rising magma hot spots. See plate tectonicsplate tectonics,
theory that unifies many of the features and characteristics of continental drift and seafloor spreading into a coherent model and has revolutionized geologists' understanding of continents, ocean basins, mountains, and earth history.
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.

Lava

 

(Polish Łyna), a river in Kaliningrad Oblast, RSFSR, and in Poland; a left tributary of the Pregolia River. The Lava measures 289 km long and drains an area of 7,130 sq km. It originates from the Masurian Lakes in Poland and is fed by snow, rain, and groundwaters. The mean flow rate at the mouth is 40.4 cu m/sec. The Lava freezes during the winter for a period of two to three months. It is navigable in its lower course and is linked with Lake Mamry by the Masurian Canal. The city of Pravdinsk is located on the river.


Lava

 

liquid-molten, primarily silicate material that issues out onto the earth’s surface during volcanic eruptions. It differs from magma by the absence of gases, which escape into the air during the eruption.

Different effusive rocks form from the lava depending on its composition during solidification. Acidic, silica-rich rhyolitic lavas are viscous and usually relatively cool; as a rule, they form domes and, more rarely, spread in the form of lava flows; eruptions are accompanied by a large quantity of ejecta which, together with sedimentary material, is deposited in the form of various tuffs. Medium-composition (andesite) and basic (basaltic) lavas are more mobile and, near the vent, where their temperature is sufficiently high (up to 1000o-1200°C), may flow as fast as 30 km/hr. In cooling gradually the lava becomes viscous and the rate of flow decreases to a few meters an hour. Lava sometimes issues from the central crater, but more often it issues from the lateral lava fissures (bocca) and flows along depressed parts of the relief in the form of lava flows. When there are large eruptions, lava fills up all depressions and spreads over the surface, forming lava sheets; in such cases “mountain plains,” or lava plateaus, often occur.

V. P. PETROV


Lava

 

a battle formation and tactical procedure used by the cossack hosts and, with the institution of the 1912 Cavalry Regulations, in all the Russian cavalry.

The troop lava consisted of a forward part (one to four platoons) and a support (at least one platoon) or a guide (one squad). The forward part operated in different orders (primarily a single rank). Among its missions, the lava formation was used for scouting the terrain and enemy forces, disorganizing closed enemy battle formations before a mass cavalry attack, covering a maneuver by friendly troops, and pursuing the enemy.

What does it mean when you dream about lava?

Dreaming about lava can reflect a number of different conditions, from a fever to overheated sexuality or emotions. Something from our past that erupts to the surface.

lava

[′lä·və]
(geology)
Molten extrusive material that reaches the earth's surface through volcanic vents and fissures.
The rock mass formed by consolidation of molten rock issuing from volcanic vents and fissures, consisting chiefly of magnesium silicate; used for insulators.

lava

1. magma emanating from volcanoes and other vents
2. any extrusive igneous rock formed by the cooling and solidification of molten lava

LAVA

A language for VLSI that deals with "sticks", i.e. wires represented as lines with thickness.

["A Target Language for Silicon Compilers", R.J. Matthews et al, IEEE COMPCON, 1982, pp. 349-353].
References in periodicals archive ?
Brian Curley of Schmidt Curley Design, which created all 10 courses at Mission Hills Haikou, said he enjoyed the challenge of working on a bed of lava rock, which is easily recognisable due its 'pockmarked' surface.
Embedded within the lava were pockets of sediments from the seafloor.
The region features numerous solidified lava flows of different ages.
As fellow Windy city residents, we wanted to commemorate Barack Obama's historic presidency with a special edition Lava Lamp," said Larry Gutkin, chief executive officer, Lava Lite LLC.
But Lava Man took a half-length lead at the head of the stretch and held off all challengers in an eight-horse field that was reduced by one when Arson Squad became a morning scratch because of a popped abscess on the top of his foot.
The thickness of mineral layers that had formed on the surfaces of lava chunks suggests that the undersea volcanoes were last active 50,000 to 1 million years ago, the researchers report in an upcoming Science.
The company has identified several niches to help time- and space-challenged consumers by combining the functionality with the Lava brand motion lamp's iconic shape.
Lava will also perform (w)HOLE at the Flea Theater in New York's TriBeCa neighborhood for a five- to seven-week run beginning January 5.
From the chopper, Edmonds treks over the sugar-textured pahoehoe (pah-hoy-hoy) lava.
With HotFoot Host Enterprise, Digital Lava provides customers with an "out-of-the-box" enterprise asset management system for HotFoot presentations.
Instead, the helo struck the lava field short of the landing zone with little forward airspeed or vertical velocity.
of lava runs into the ocean daily, coming close to glowing lava depends more on the whim of Pele, the Hawaiian goddess of volcanoes, than on any firm patterns of scientific predictability.