Volcanoes and Plate Tectonics
What is the major volcanic belt in the world?
Ring of Fire
Beneath a volcano, magma collects in a pocket called ________ _________.
Magma chamber
What are tall, cone shaped mountains in which layers of lava alternate with layers of ash?
Composite Volcanoes
The movements of the ______ and North American plates produce California's geological features
Pacific
What is a weak spot in the crust where molten material, or magma comes to the surface?
A volcano
Volcanic belts form along the boundaries of Earth's _______.
Plates
Magma moves upward from a volcano through a ________.
pipe
What are the two types of intrusions (magma hardens to form igneous rock)
One goes across (like cutting cake)
other goes in between like PB &J
Across= Dike
&
inbetween= sill
Are often found near plate boundaries
What are faults
When magma reaches the surface, it is called ______.
Lava
A volcano is created when plates _______ or when it is __________ beneath a continental plate.
collide, subducted
What helps push magma out of a volcano during an explosion?
forces from the gases expanding
Made up of thin layers of runny lava that travels long distances from cracks in the ground.
Lava PLateau
The Juan de Fuca plate is being __________ beneath the North American Plate to produce Mount Shasta or Lassen Peak
subducted
What is a fountain of water and steam that erupts from the ground?
A geyser
What is an area where material from deep within the mantle rises and then melts, forming magma?
A Hot spot
Volcanoes with lava high in silica (lots of stuff/traps gases more) would have what type of an eruption?
explosive
What kind of volcano is small with steep angled sides, and spits lava high in silica? Example is Parictin in Mexico
What is a cinder cone volcano?
Board bowl shaped valley
basin
What is the material found in magma that is formed from the elements of oxygen and silicon.
Silica
What is a molten mixture of rock-forming substances, gases, and water from the mantel?
What is the classification of a volcano who does not currently have activity but shows signs of exploding or being active in the future?
Dormant
What kind of volcano has quiet eruptions or lava which is too thick to flow a great distance and piles up at the vent, creating a gently sloping dome?
Shield Volcano
Central Valley
What is a hardened magma pool called?
What is a batholith?