Volcanoes: Nature’s Awesome
Power by Maryann Dobeck
Introduction
Lava melted rock that has erupted from
a volcano onto earths surface.
According to the Hawaiian myth the
goddess of volcanoes named Pele
made mountains blow their top.
The scientists today know that the
forces of nature because volcanic
eruptions.
Inside Story
The core of the earth is iron and nickel.
The outer core is liquid and the inner
core is solid.
Plate tectonics believe that the entire
crust and upper mantle are
Most of the world’s erupting volcanoes
occur along the edges or boundaries of
earth’s plates
Volcanoes
 Vents a weak spot in the earth’s crust
through which magma can rise to the
surface
 Three kinds of materials may erupt
from a volcano: lave, tephra, and
gasses
 The terms pahoehoe and aa are
Hawaiian words that describe the lava
flow
Pyroclastic Flow
 Pyroclastic flow a tall column of
pyroclastic materials and gasses that
collapses and races down the slopes of
the volcano at dangerous speeds
 When a volcano erupts it can spew out
anything from fine particles of dust to
huge blocks of rocks as big as a house
 All volcanoes release gages during an
eruption. The pressure of the gas in the
magma causes the eruption. The
pressure of the gain the magma causes
the eruption.
Ocean floor
 The tectonic plates on the ocean floor
are thinner than the plates on land.
 Some volcanoes rise more than a mile
above the ocean floor.
 Each of Hawaii islands is actually the
tip of an underwater volcano.
When volcanoes erupt
 Scientist call the least violent kind of
eruption a Hawaiian eruption.
 In a Strombolian eruption, gas
periodically escapes from the magma
sending out volcanic material that
forms a cinder cone.
 A pyroclastic flow temperature of the
flow to have reached 1,300 degrees
Fahrenheit.
Famous volcanoes
 Mount Vesuvius erupted ash, and lava
buried the towns of Pompeii, and
Herculaneum and Stabiae.
 Krakatoa had a powerful eruption. The
blast was so loud people 3,000 ml.
away heard it.
 Mount Pinatubo erupted in a powerful
blast 10 times larger than the eruption
of Mt. St. Helens.