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Volcanoes (Ch 5)

Name:________________________
Class: ___________ Date: ________
Across
Lava ____ is the spread of lava as it pours out of a vent.
_______ is a material found in magma that forms from the elements oxygen and silicon.
Volcanoes have a long tube called a _____ through which magma moves from the magma chamber to Earth's surface.
The large hole formed when the roof of a volcanoe's magma chamber collapses.
Thin layers of lava slowly build a wide, gently sloping mountain called a ______ volcano.
A ______ is a bowl-shaped area that may form at the top of a volcano around the central vent.
Volcanic _____ can be quiet or explosive.
A mountain that forms in Earth's crust when molten material, or magma reaches the surface.
Volcanoes form along the mid-ocean ____ where two plates move apart.
An _____, or live volcano is one that is erupting or has shown signs that it may erupt in the near future.
A volcano erupts _____ if its magma is high in silica.
A volcanic ______ forms when magma hardens in a volcanoe's pipe and the surrounding rock later wears away.
Molten rock and gas leave the volcano through an opening called a ______.
A _____ is a mass of rock formed when a large body of magma cools inside the crust. Over millions of years, the overlying rock wears away.
A ______ or sleeping volcano is a volcano that scientists expect to awaken in the near future.
Mostly quiet eruptions formed the ______ islands.
A _____ _____ is an area where material from deep within Earth's mantle rises and a volcano my form.
________ National Park in Wyoming marks a huge hot spot under the North American Plate.
The Ring of Fire includes many volcanoes that rim the ______ Ocean.
Down
A ______ mountain forms when uplift pushes a large body of hardened magma toward the surface.
A slab of volcanic rock formed when magma squeezes between layers of rock.
After millions of years, repeated floods of lava can form high, level ________.
The explosive eruption of Mount St. ______ in 1980, blew off the top of the mountain.
Volcanic belts form along the boundaries of Earth's _______.
_______ volcanoes are tall, cone-shaped mountains in which layers of lava alternate with layers of ash.
Materials from an explosive volcano can build up a steep, cone-shaped hill or small mountain called a _______ cone.
A string of volcanoes that form as the result of subduction of one oceanic plate beneath a second oceanic plate.
The _______ _______ ______ is one major belt of volcanoes.
Beneath a volcano, magma collects in a magma ______.
A slab of volcanic rock that forms when magma forces itself across rock layers.
A _____ flow is the mixture of hot gases, ash, cinders and bombs that flow down the sides of a volcano that erupts explosively.
An _______, or dead volcano is a volcano that is unlikely to ever erupt again.
A volcano erupts ____ if its magma is hot or low in silica.