Volcano 1
What is molten rock that is under the earth's surface?
magma
Magma and pyroclastic material erupt through a volcano's ________.
vent
What is the most active volcanic region?
What is the Ring of Fire
What is magma called when it is on the earth's crust?
At what two boundaries do volcanoes primarily form?
Convergent & Divergent Boundaries
What is created when two oceanic plates diverge?
mid-ocean ridge
The ring of fire has many convergent boundaries where the oceanic plate dives below the continental plate. This is called _______________.
subduction
A fast-flowing mudslide created by volcanic steam, melted glaciers, and sediments.
Lahar
What kind of rock is formed when lava cools and hardens?
igneous rock
Name and describe the 3 classifications of volcanoes based on activity.
Active - has erupted in recent human history
Dormant - not active; not eroded
Extinct - not active; eroded
Name the 3 types of volcanoes.
Shield, Cinder Cone, Composite or Stratovolcano
Yellowstone is filled with geysers, hot springs, and fumaroles. It is the result of a collapsed super volcano forming a caldera. Would this be considered active, dormant, or extinct?
Active
What type of volcano is Paricutin in Mexico? It erupts violently and has steep sides. It isn't as massive as a composite volcano.
cinder cone
What type of volcano and activity is Mauna Kea on the Big Island of Hawaii?
shield volcano; dormant
What type of volcano and activity is Mt. Rainier?
Composite volcano; active
Volcanoes that are inactive, but have NOT eroded are considered to be _____________.
dormant
Describe 2 characteristics of a cinder cone.
Emits pyroclastic material (ash, cinder, bombs)
Explosive
Steep sides
Smaller size
Name 3 characteristics that describe a composite volcano.
Alternating layers of lava and tephra (rock)
Medium size and slope
Most common type of volcano
Name three characteristics that describe a shield volcano.
Emits relatively quiet flows of lava
Largest Volcano
Slopes are more gradual
Describe a caldera.
A caldera is massive and is the result of a volcano collapsing inward.