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Question

ANSWER IN COMPLETE SENTENCES. DONT WRITE "GOOGLE IT" OR SOMETHING STUPID LIKE THAT.............................................

DESCIRIBE THE FOUR TYPES OF LAVA.
WHAT ERUPTS FROM A VOLCANO?
WHAT ERUPRION PRODUCES PYROCLASTIC MATERIAL?
DESRCIBE A NONEXPLOSIVE ERUPTION.
GIVE THE THREE KEYS IN THE MAGMA TO WEATHER AN ERUPTION WILL BE AN EXPLOSIVE ONE.

Answer 1

The surfaces produced by lava flows often reflect their internal movement in relation to their congealing crust. Sheet- and pahoehoe lava flows result in continuous surfaces. Aa- and block flows result in discontinuous surfaces. The terms "pahoehoe" and "aa" are Hawaiian words.

small volumes of hot, fluidbasalt. The higher the volume of lava emitted the faster the current. Pahoehoe flows move forwards in tongues or lobes and are characterized by a glassy, plastic skin. They may embrace obstacles at a rate of about 50m an hour. When the pahoehoe lava flow cools, it often solidifies to a smooth surface.
Sheet lavas emerge from fissure systems forming flows commonly ranging between 10m and 30m in thickness. They flow out so fast that vast volumes of basalt are discharged over an enormous area. Featureless lava plateaus are formed. During the eruption of Roza, Oregon, 14 million years ago, 1500km3 of sheet lavas were produced in about a week.

Aa flows are emitted from the vent at high rates ranging to 50km an hour, often with much lava fountaining. They are characteristic of viscous magmas. Aa flows are animated with sporadic bursts of energy. They may push down houses, walls and forests. However, the hallmark of aa lava flows is the very rough surface it produces when it cools and solidifies.

Block-lavas are often emerged in a fairly viscous state. They tend to be both stronger and thicker than aa lava flows. The more silicic the magma, the shorter and stubbier is the flow. Block lavas move slowly at a rate ranging from 1 to 5 meter a day. When solidified, they are characterized by often cubic masses with relatively smooth faces. In comparison with aa lava flows the surfaces of block lavas are much less rough and pitted than aa lava flows.


First a volcano makes something called magma from melted rock. The magma goes through a circulation. It has to form at the bottom of the volcano and then start its way up the main vent. The main vent is a hole that is in the volcano and when the volcano is ready to erupt the lava is at the top of the main vent. The magma goes up the main vent slowly while it is still getting hotter. When the magma is about half way up the main vent it turns into lava. Lava is a very hot liquid which burns the remaining rocks from the magma. The lava slowly continues up the main vent. While going up the lava continues to get hotter and hotter. Ash and rocks are collected and the lava is getting hotter and hotter while the lava is continuing its way up the main vent. When the lava is at the top of the main vent the volcano erupts. The lava blasts out of the volcano along with ash, rocks, and a cloud of dust that is very thick. The ash and rock crumble to the ground, but the lava is either moving down the volcano side very slowly or at a high speed. The lava burns down almost everything in its way, and it sometimes leaves bits of things burning. The lava from the volcano can cool fast, or sometimes the lava will slowly cool down from its intense heat. Lava that cools slowly forms igneous rocks. There are many types of igneous rocks. Volcanoes can damage themselves in the explosion. A volcano literally blows its top off. One of the volcanoes that has blown its top from an explosion is Mt. St. Helens. Mt. St. Helens has erupted more than once.

all eruption produces pyroplastic materials.

Nonexplosive eruptions produce lava flows and eject very little pyroclastic material into the air. The lava comes out of rifts in the sides of the volcano, or vents in a rift. Tephra is rarely ejected during a nonexplosive eruption. Nonexplosive eruptions are characterized by basaltic lava and by the type of volcanoes they form, called shield volcanoes.

Answer 2

There are two types of lava: aa and pahoehoe. Look these up in a dictionary for details. Volcanoes throw ash, steam, various gases (some toxic) and rocks as well as molten material. A pyroclastic flow results when a volcano explosively vents gas and hot ash; it can be very dangerous. An eruption is more likely to be violent if the magma contains water.

Answer 3

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