Answer:

TYPES OF VOLCANOES

1.CINDER CONE VOLCANO

•Simplest type of volcano

•occur when particles and blobs of lava are ejected from a volcanic vent

•Lava is blown violently into the air,and the pieces rain down around the vent and builds up a circular or oval shaped cone,with a bowl-shaped crater at the top.

•Rarely grow larger than about 1,000 feet above their surroundings.

2.COMPOSITE VOLCANO

•Also known as stratovolanoes which make up some of the worlds most memorable mountains

•Have a conduit system inside them that channels magma from deep within the Earth to the surface

•have clusters of vents with lava breaking through walls or issuing from fissures on the sides of the mountain

•can grow thousands of meters tall and can explode violently

3.SHIELD VOLCANO

•Are large,broad volcanoes that look like shields from above

•the lava that pours out of shield volcanoes is thin so it can travel for great distances down the shallow slopes of the volcano

•build up slowly over time with hundreds of eruptions,creating many layers

•are not likely to explode catastrophically

TYPES OF ERUPTION

A.PHREATIC OR HYDROTHERMAL

Is a stream driven eruption as the hot rocks come in contact with water.It is short lived,characterized by ash columns but may be an onset or a larger eruption.

B.PHREATOMAGMATIC

Is a violent eruption due to the contact between water and magma.As a result, a large column of very fine ash and high speed and sideways emission of pyroclastic called base surges are observed.

C.STROMBOLIAN

A periodic weak to violent eruption characterized by fountain lava.It is consisting of ejection of incandescent cinders,lapili,and lava bombs,to altitude of tens to a few hundreds of meters.

D.VULCANIAN

It is characterized by tell eruption columns that reach up to 20km high with pyroclastic flow and ash fall tephra.They usually commence with phreatogmatic eruptions which can be extremely noisy due to the rising of magma and heating of water in the ground.

E.PLINIAN OR VERSUVIAN

It produces a sustained convicting plumes of pyroclasts and the gas is rising more than 25km above sea level.

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