Lava(redirected from Lavas)
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(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.
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
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.
["A Target Language for Silicon Compilers", R.J. Matthews et al, IEEE COMPCON, 1982, pp. 349-353].