Continental Crust
What are the two main intrusive igneous rocks that make up the continental crust?
Granite & Andesite
What is part of the lithosphere is split into oceanic and continental?
Crust
What is melting to create magma
Rock, oceanic plate, subducting plate
Which ocean does this ring surround?
Pacific
What is the classic intra-plate volcanism example in the middle of the pacific ocean (50th state of the United States)
Hawaii (hotspot)
What happens when oceanic crust converges with continental crust?
Subduction of the oceanic crust occurs
What are tectonic plates?
Broken slabs of lithosphere creating plate tectonics and the different plate boundaries.
Define subduction?
denser material is forced beneath the lighter one
Why does the Pacific plate subduct when colliding with the other surrounding plates?
Denser
What is the movement associated with a hotspot
The lithospheric plate (generally oceanic) moves in one direction over the magma plume.
Why does the magma rise to form magma through the continents?
Which lithospheric plates are more dense?
Oceanic 3.0g/cm3
The majority of the 'Pacific Ring of Fire' what type of convergence would you find?
Convergent continental - oceanic
Which US states are located on the Pacific Ring of Fire?
California, Oregon, Washington, Alaska
What is the example of the continental intra-plate volcanism mostly in Wyoming?
Yellowstone Caldera
Volcanoes that form from subduction on the coastlines of continents are called.....
Continental Volcanic Arc or Range
Which is thicker? Oceanic or continental crust
Oceanic (5-7 miles)
Continental (20-35 miles)
What ocean floor feature is found typically near areas of subduction?
An Ocean trench
What type of volcanoes are common on the Pacific Ring of Fire?
Composite or Stratovolcano
What is the magma called when its stationary in the lithosphere?
Magma plume
What is the average density of the continental crust?
2.7g/cm3
What is the 'Moho'
Depth at which seismic waves change speed, indicating the change from solid lithosphere to semi-solid asthenopshere and the generation of melt.
What mechanism is driving the convergence of plates?
Convection currents in the asthenosphere
How many volcanoes are located on or generated because of the Pacific Ring of Fire
452
Describe why its called intra-plate volcanism?
Intra-plate means in the middle of a plate, not near the edge or BOUNDARY.