Show volcanic forces of in most cases the mighty forces thi that at start and continue volcanic eruption the squeezing force of gravity and the explosive forces of steam and ad ther other glise gases originate P in the earth probably many miles iles it down own ahe 1 I he melted roe rock tany or lava that th a I 1 is an essential s eid pa part I 1 of f in most at eruptions eruption xa also starts from rom the these great depths it 11 is pushed up the h s pipe of the volca volcano noI to IS in the ec crater in t er where it flows out or Is ext exploded a c out when an eruption has r run ma its lessure sure and originate deep in the earth uc iava in the me pipe a and d solidifies if it completely seals up up th the e pipe with a plug of r rock rek ek I 1 th the evol volcano cano becomes dormant or c extinct it if the pipe pip is choked do down to very small proportions so that at a trickle of lava and hot gases rise to keep a little little cauldron cauldren caul dron of molten rock ck bubb bubbling I 1 g I 1 in the crater the valc volcano ano remains a slightly ate 1 active all 1 I 1 the bombs hombs in existence dropped d a on I 1 the h a top of 1 the old cold solid plug of f a dormant volcano coul could d not wake the sleeping forces far below in it 4 the case of a slightly active volcano 1 I es a even the explosion e of the biggest b Is gg bombs would d do little more mare than splash 17 lava about ban the e crater te bombs hav have e been use used ad advantageously tadeous I 1 Y in controlling a one kind k addan of f volcanic phenomena on 0 the a slopes I 1 dp 0 of mauna loa on the island of lie ha wan aava it lava streams that threatened to IQ flo bow in into t a streams vi asea and even ort ato the it 0 city of a f kilo H un have line been n I 1 turned asid aside by bomb explosions v |