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A volcano that shows signs of eruption or has erupted recently.
Small pieces of magma thrown out of a volcano. The ash pieces that
fall near the volcano opening form the crater.
A large circular hole, usually over a mile in diameter, produced
when a volcano falls in on itself.
A steep, sloping volcano made of layers of ash and lava that builds
up from past eruptions.
A circular movement in a liquid that carries heat from one place
to another. In the earth, this happens in the mantle.
The large opening at the top of a volcano produced by the explosion of
an eruption. It is smaller than a caldera.
The layer of hard rock that surrounds the earth. It is between 21 and 125
miles thick.
A volcano that has not erupted for a long time, but may erupt again one day.
The sudden explosion of hot rocks, gases and other material through a hole in the
earth’s surface.
A volcano that hasn’t erupted for thousands of years and probably will not
erupt again.
Energy made by using underground steam; the steam produces electricity.
A volcanic mudflow which is a mix of water, volcanic ash, and some
gases which moves fast down a valley.
The hot liquid magma that flows from a volcano that is erupting. It is liquid
magma without its gases. There are two main types of lava: thick sticky lava and
liquid runny lava. It is usually orange, red, or yellow, and is over 1,470 degrees
Fahrenheit.
Liquid magma that is flow from the volcano on the earth’s surface.
The melted rock produced inside the earth. When a volcano erupts, magma comes
to the surface and is called lava.
An area filled with magma that lies beneath a volcano.
The layer of hard rock immediately between the earth’s crust and its core.
Beneath the mantle, some of the rocks are liquid and move.
A flow of water and debris that usually looks like brown liquid cement.
Heavy rain, melting snow, and ash mix together during an eruption and produce
mudflows.
A section of the earth’s crust made by weak spots in the earth’s
crust and boiling magma. It floats on the mantle layer. Often volcanoes and
earthquakes occur at the edges of the earth’s plate.
Lava from a volcano that is in the form of chunks smaller than an apple, about
the size of marbles.
A large lump of lava thrown out of a volcano during an eruption. A bomb usually
starts as a flying blob of lava, but solidifies as it falls to the ground.
Lava in the form of small, tiny particles thrown from a volcano during an eruption.
Lava, ash, and gases that are brought to the surface when a volcano erupts. 
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