Volcanoes – Ch. 6 Review for Test

Volcanoes  What’s the difference between magma and lava?  There are two areas that volcanoes occur. What are they?  Magma is still in the ground and lava is outside of the volcano  Plate boundaries such as the “Ring of Fire” and hotspots, such as the Hawaiian Islands.

Volcanoes  The stages of the life of a volcano are ______, _______, and ________.  A high amount of silica in magma causes what type of eruption?  A low amount of silica?  Active, dormant, extinct  Explosive, AKA pyroclastic flow  A quiet eruption

Volcanoes  The bowl shaped area at the top of a volcano is called a ____________.  The huge hole left by the collapse of a volcanic mountain is called a ___________.  Crater  Caldera

Volcanoes  Magma can harden under ground and make these landforms:  Lava and ash combine to make these landforms:  Volcanic necks, sills, dikes, and batholiths  Shield, cinder cone and composite volcanoes, and lava plateaus

Volcanoes  What are the three types of volcanoes that we studied? Give a description of each type in terms of shape, types of eruptions, and what they are made of.  Shield – gently sloping, quiet, lava  Cinder cone – steep/tall, explosive, ash, cinders bombs  Composite – Medium/conical, quiet and explosive, lava, ash, cinders and bombs

Volcanoes  What are the main parts of a volcano?  Volcanic rock is called ___________ rock  Two types of igneous rocks are:  Magma chamber, pipe, vent, side vent, crater, ash cloud, lava flow  Igneous  Pumice and obsidian

Volcanoes  Large groups of volcanoes are in the Ring of Fire. The islands of Japan, Indonesia, New Zealand, the Philippines, and the Aleutians are all ___________.  Island Arcs

Volcanoes  What is a basin?  Where is the huge basin of California located?  A broad, bowl shaped valley.  Between the Sierra and Coast Ranges of mountains