Volcanoes

A few hundred years ago , ____________________ believed that volcanoes were ____________________ mountains of fire . today we know they're really ____________________ or ____________________ to the hot interior of the planet .
About 1500 volcanoes around the world are classified as ____________________ . Nearly ____________________ of these ____________________ in the Ring of Fire , a ____________________ circling the pacific ocean . Their location is no accident .
While the ____________________ surface looks stable , its ____________________ is made up of immense ____________________ of rock like puzzle pieces that constantly ____________________ . Where these tectonic ____________________ interact volcanoes often form . Friction from shifting plates ____________________ the Earth's crust causing rock beneath the crust to liquify . This ____________________ rock or ____________________ then becomes a volcano by erupting through ____________________ in the plates .
Once magma escapes from the earth , it's called lava . But not all lava is the same . Running lava ____________________ quickly and forms the general ____________________ of ____________________ volcanoes . Thick , ____________________ lava doesn't flow as far and tends to form the steeper slopes of composite volcanoes .
____________________ volcanoes can erupt violently hurling ash and lava at speeds up to ____________________ miles per hour . These eruptions sometimes blow away large ____________________ of the volcano itself .
Some volcanoes like Hawaii's Kilauea forms a ____________________ in the Earth's crust where magma ____________________ in the middle of a ____________________ plate . Kilauea is one of the most active volcanoes on the planet and has erupted continuously since 1983 . Because Kilauea is a shield volcano , this constant eruption is a ____________________ one . Lava ____________________ from Kilauea constantly ____________________ into new land , making Hawaii the only state that is still ____________________ .
Living near a volcano can be ____________________ as the residents of Pompeii learned in the year ____________________ AD when mount Vesuvius erupted , ____________________ superheated ____________________ , poisonous gas and rocks . This ____________________ combination called the pyroclastic flow is far more dangerous than the lava flow . Vesuvius buried Pompeii claiming the lives of ____________________ people .
Though volcanoes can be deadly , they also ____________________ benefits . Volcanoes created ____________________ of the Earth's surface as well as much of the air we ____________________ today . Volcanoes create rich soil for farming and many countries harvest their subsurface ____________________ to create ____________________ energy .
Both creators and ____________________ , volcanoes prove that beneath its calm surface earth remains a living planet and a ____________________ one .