| Show eruption of volcanoes ascribed to the tides not all active volcanoes erupt as did mount etna recently liko a boiled over pot bany explode shooting dust and ashes miles into theair the non explosive character of etna ta ascribed by to tact that its lava Is a relatively thin liquid which allows steam and gas bubbles to escape readily in explosive volcanoes the lava Is thick it holds back steam and gas stubbornly causing immense pressure beneath and eventually a violent eruption because practically every active volcano in the world Is locate J not far from large bodies of water the theory Is advanced by dr william bowle of the united states coast and geodetic survey and others that the kneading action of the periodic tides twists the earth forcing up the lava and causing volcanic activity |