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.