Volcanoes Crossword Puzzle

QUESTIONS LIST:

• extinct : an _ , or dead volcano is a volcano that is unlikely to ever erupt again.
• eruptions : volcanic _ can be quiet or explosive.
• silica : _ is a material found in magma that forms from the elements oxygen and silicon.
• caldera : the large hole formed when the roof of a volcano's magma chamber collapses.
• chamber : beneath a volcano, magma collects in a magma _ .
• ridges : volcanoes form along the mid-ocean _ where two plates move apart.
• pipe : volcanoes have a long tube called a _ through which magma moves from the magma chamber to earth's surface.
• explosively : a volcano erupts _ if its magma is high in silica.
• vent : molten rock and gas leave the volcano through an opening called a _ .
• flow : lava _ is the spread of lava as it pours out of a vent.
• active : an _ , or live volcano is one that is erupting or has shown signs that it may erupt in the near future.
• neck : a volcanic _ forms when magma hardens in a volcano's pipe and the surrounding rock later wears away.
• shield : thin layers of lava slowly build a wide, gently sloping mountain called a _ volcano.
• plates : volcanic belts form along the boundaries of earth's _ .
• quietly : a volcano erupts _ if its magma is hot or low in silica.
• composite : _ volcanoes are tall, cone-shaped mountains in which layers of lava alternate with layers of ash.
• crater : a _ is a bowl-shaped area that may form at the top of a volcano around the central vent.
• dormant : a _ or sleeping volcano is a volcano that scientists expect to awaken in the near future.
• dome : a _ mountain forms when uplift pushes a large body of hardened magma toward the surface.
• volcano : a mountain that forms in earth's crust when molten material, or magma reaches the surface.
• hawaiian : mostly quiet eruptions formed the _ islands.
• pacific : the ring of fire includes many volcanoes that rim the _ ocean.
• plateaus : after millions of years, repeated floods of lava can form high, level _ .
• sill : a slab of volcanic rock formed when magma squeezes between layers of rock.
• dike : a slab of volcanic rock that forms when magma forces itself across rock layers.