Volcano 1
What is molten rock that is under the earth's surface?
magma
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
Magma and pyroclastic material erupt through a volcano's ________.
vent
What kind of rock is formed when lava cools and hardens?
igneous rock
Pyroclastic ash layered on the ground is called _______.
tephra
What is created when two oceanic plates diverge?
mid-ocean ridge
True or False: Magma is less dense than the crust.
True
Volcanoes that are inactive, but have NOT eroded are considered to be _____________.
dormant
The ring of fire has many convergent boundaries where the oceanic plate dives below the continental plate. This is called _______________.
subduction
A cloud of ash and hot gases that moves rapidly down a volcano's slopes.
Pyroclastic Flow
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
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
Name the 3 types of volcanoes.
Shield, Cinder Cone, Composite or Stratovolcano