SUPPORT,NOVA,WATCH,TV,SCHEDULE,EDUCATION,SHOP,SEARCH,SHARE,ANATOMY,VOLCANO,LEXI,KROCK,WHATS THE DIFFERENCE,LAVA,MAGMA,VOLCANIC VENTS,DIKES,FISSURES,EXPLORE,GEOLOGICAL FEATURES OF,MT ST HELENS,MATERIALS,VOLCANIC ERUPTIONS,LEARN,THE VARIOUS,PARTS,DIAGRAM,READ,PHOTO,CREDIT,WGBH EDUCATIONAL FOUNDATION,VOLCANOES,RANGING,HAWAIIAN,TYPE,GENTLE,EFFUSIVE ERUPTIONS,TOURISTS,OBSERVE,MERE,STEPS,AWAY,ANDESITIC,VARIETY,PRODUCE,VIOLENT LIFE,THREATENING,ERUPTIONS,LITTLE,WARNING,VOLCANOLOGISTS,STUDY,KIND,GREATEST,CONCERN,KILLING,THOUSANDS,PEOPLE,ENTIRE,CITIES,FORESTS,LOCAL ECONOMIES,FAMOUS,POWER,GALERAS,NEVADO DEL RUIZ,MT VESUVIUS,BELOW,THE MAJOR,FEATURES,TECTONIC PLATES,EACH OTHER,ENOUGH,FRICTION,HEAT,CREATE,ROCK,THE SURFACE,THE EARTH,SOLIDIFIES,OVER TIME,CLASSIC,CONE,DAME,HUGE,PLUME,JULY 22,USGS,VOLCANIC ASH,MINERAL,VOLCANIC GLASS,FRAGMENTS,SMALLER THAN,TENTH,INCH,DIAMETER,MDASH,PINHEAD,SOFT,FLUFFY,RESULTS,BURNING,WOOD,LEAVES,PAPER,HARD,DISSOLVE,WATER,PARTICLES,LESS THAN,COMMON,ABRASIVE,SIMILAR,CRUSHED,WINDOW,GLASS,CORROSIVE,ELECTRICALLY CONDUCTIVE,EXPLOSIVE ERUPTIONS,THE SHATTERING,SOLID,ROCKS,VIOLENT,SEPARATION,TINY,PIECES,GROUNDWATER,CONVERTS,STEAM,VOLCANIC GASES,DISSOLVED,EXPAND,ESCAPE,GAS,RISE,QUICKLY,ERUPTION COLUMN,ABOVE,THE VOLCANO,ERUPTION,UNZEN VOLCANO,KYUSHU JAPAN,RISES,THE WALLS,CORBIS,LAVA FLOW,LAVA FLOWS,MASSES,ONTO,EARTHS SURFACE,EFFUSIVE ERUPTION,MOVING,SOLIDIFIED,DEPOSITS,COME IN,SHAPES AND SIZES,WIDE,RANGE,VENT,TOPOGRAPHY,TRAVELS,VISCOSITY,RIVER,RUNS,VALLE DEL BOVE,MOUNT ETNA IN,SICILY,LAVA DOME,LAVA DOMES,STEEP,SIDED,MOUNDS,FLOW,DACITE,MAGMAS,VISCOUS,MOVE,THE VENT,COOLING,CRYSTALLIZING,DOMES,CONSIST,AERIAL,VIEW,FOOT,THE CRATER,WASHINGTONS,SEEN,THE MAY,LAVA LAVA,THE WORD,GEOLOGISTS,TERM,DESCRIBE,EXAMPLE,LAVA BOMBS,BLOCKS,THE ITALIAN,WORD,STREAM,DERIVED,VERB,LAVARE,WASH,FAST,MT ETNA,BEGIN,COOL,DEVELOP,CRUST,VENTS,OPENINGS,EARTHS CRUST,THE GROUND,THE ATMOSPHERE,STRUCTURE,FISSURE,FRACTURE,GROUND,CRACK,RELEASE,SHIELD VOLCANOES,CALDERAS,FUMAROLES,MOUNT ASAHIDAKE,HOKKAIDO JAPAN,TEPHRA,GENERAL,VOLCANIC ROCK,BLASTED,EXPLOSIONS,UPWARD,GASES,COLUMNS,FOUNTAINS,DENSE,BOMBS,LIGHT ROCK,DEBRIS,SCORIA,PUMICE,RETICULITE,HOT LAVA,CRATER,KILAUEA,EAST,RIFT,CALDERA,DEPRESSION,THE SUMMIT,UNDERGROUND,VOLUMES,LOSS,STRUCTURAL,OVERLYING,LEADING,COLLAPSE,FORMATION,SMALLER,EXPLOSIVE,EXCAVATION,MOUNT ASO,LARGE CLOUD,ASO NATIONAL PARK,THE MOUNTAINS,WORLDS,LARGEST,LAHAR,INDONESIAN,FLOWING,MIXTURE,SLOPES,LAHARS,VOLCANIC,MUDFLOWS,DEBRIS FLOWS,THE RAPID,MELTING,SNOW,ICE,PYROCLASTIC FLOWS,INTENSE,RAINFALL,LOOSE,BREAKOUT,LAKE,DAMMED,CONSEQUENCE,AVALANCHES,TORE,STREET,HOMES,THE PROCESS,DWINDLE,CENTRAL,PERIOD,HOURS,DAYS,POURING,OPEN,PROCESS,SOMETIMES,CLOSE UP,SURFACE,COOLED,DIKE,TABULAR,SHEET,BODIES,CUT THROUGH,LAYERING,ADJACENT,CREATES,FORCING,HUNDREDS,THE CONE,INNER CORE,ZONES,WEAKNESS,EXPOSED,FEET,MAUNA LOA VOLCANO,HAWAII,BENEATH,LIQUID,MELT,MINERALS,CRYSTALLIZED,THE CONDUIT,XENOLITHS,COLLECTS,INSIDE,MAGMA CHAMBER,BELLY,AS IT,FLOWS,THE PACIFIC,OCEAN,GLOSSARY,BLOCK,SOLID ROCK,FRAGMENT,GREATER THAN,THREE INCHES,BOMB,ACQUIRE,AERODYNAMIC,SHAPES,FLY,THROUGH THE AIR,ROCK TYPES,PLINIAN,STYLE,DACITE LAVA,PERCENT,SILICA,TEMPERATURES,C,LIGHT GRAY,IN COLOR,FRAGMENTATION,VIOLENTLY,FUMAROLE,HORNITO,FORCED,OPENING,INCLUSION,ENCLOSED,FOREIGN,LIGHT,POROUS,PYROCLASTIC FLOW,GROUND HUGGING,AVALANCHE,VOLCANIC GAS,RUSHES,DOWN,THE SIDE,AS FAST AS,MILES,HOUR,RHYOLITE LAVA,CONTENT,QUARTZ,FELDSPAR,BIOTITE,HARDEN,TEXTURE,BUBBLY,GLASSY,LAVA ROCK,HIGH,IRON,XENOLITH,ROCK FRAGMENT,THE MASS,EMBEDDED,TEXT,FEATURE,THE U S,GEOLOGICAL SURVEY,RELATED,LINKS,DOOMSDAY,THE EXPLOSION,TICKING,TIME BOMBS,CAUSE,COLD,FAMINE,WORLDWIDE,MT FUJI,BURIED,SUPERVOLCANO,CAN WE,PREPARE,LETHAL,FORECASTING,GOOD,PREDICTING,ACTIVE VOLCANO,BLOW,THE ONLY PLACE,SCIENTISTS,FROM THE INSIDE,CLOSE,USEFUL,CREDITS,FAQS,NEWSLETTER,LABS,PBS,PRIVACY,POLICY,FEED,FEEDBACK,CORPORATE SPONSORSHIP,NATIONAL,CORPORATE,FUNDING,CANCER TREATMENT CENTERS OF,AMERICA,MAJOR,DAVID H KOCH,FUND,FOR SCIENCE,THE CORPORATION FOR PUBLIC,BROADCASTING,WEBSITE,ONLINE,WGBH,501 C,NOT FOR PROFIT ORGANIZATION,NDASH,