Show I Volcanic Forces of Pressure and Steam Originate Deep in the Earth In most cases the mighty forces that start and continue volcanic eruption the eruption the squeezing force of gravity and the explosive forces of steam and other gases originate gases originate deep in the earth probably many miles down The melted rock or orI I lava that is an essential part of most eruptions also starts from tram I these great depths It is pushed up the pipe of the volcano to the crater where it flows out or is exploded out I When n eruption has run its 0 tL iW i i course the lava in the pipe cools and solidifies If It it completely seals up the pipe with a plug of rock the volcano becomes dormant or ex ex- If It the pipe is choked down downto to very small proportions so that thata a trickle of lava and hot gases rise to keep a little cauldron of molten rock bubbling In the crater the volcano remains slightly active All the bombs in existence dropped on the top of the cold solid soUd plug of a n dormant volcano could not Jt r or f iii ii i j sN Ik wake the theA A sleeping forces far below I In the case of a slightly active volcano volcano volcano vol vol- cano even the explosion of the biggest biggest big big- gest Best bombs would do little more than splash lava about the crater Bombs have been used advantageously advantageously in controlling one kind of volcanic phenomena On the slopes of Mauna Loa on the island of Hawaii Hawaii Ha Ha- HaI I waif lava streams that threatened to flow into villages and even Into the city of Hilo have been turned aside by bomb explosions I 1 ii i |