Volcanoes I Crossword Puzzle

QUESTIONS LIST:

• fissure : this refers to a long crack in the lithosphere.
• fissure eruption : this is a type of volcanic eruption that does not involve a volcanic cone.
• columnar jointing : this is a phenomenon that occurs when basaltic lava cools & then fractures into cylindrical columns.
• shield : this is a gently-sloped ocean cone volcano composed of basaltic lava cone that may be kilometers in diameter.
• cinder cone : this type of volcano is mostly found on continents, has steep sides & consists of layers of cinders & ash.
• composite : this type of cone volcano has a symmetrical shape, is composed of layers of andesitic lava & ash & produces sudden, violent eruptions.
• andesitic : this term refers to continental volcano lava, which contains silica; it is also another name for a composite volcano
• subduction zone : most of the volcanoes that form over these are composite volcanoes.
• hotspot : this refers to the super-heated plumes in the upper region of the mantle where volcanic activity occurs.
• hawaiian : these islands are a result of hotspot activity.
• dike : this is a rock formation that results when magma escapes through fractured rock layers.
• sill : this is a rock formation that occurs when magma intrudes between rock layers, cools, hardens & may eventually be exposed by erosion.
• laccolith : this is a dome-like pooling of thick magma that occurs underground between rock layers.
• volcanic neck : this is the rock left standing when overlying layers of soil erode off of an ancient volcano, exposing the hard volcanic rock inside.
• batholith : this is a mass of intrusive igneous rock that covers thousands of square km; erosion will expose the granite rock beneath.
• intrusive : this describes the type of volcanic activity that forms the following: dikes, sills, laccoliths & batholiths.