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15 Cards in this Set

  • Front
  • Back
Massive structural changes in the earth's crust -- the entire mountian building process
The movement of magma within the earth's crust, sometimes coming to the surface
Solid rock materials bent or broken by the pressure of the crust
Plate Tectonics Theory
An explanation of the origins of volcanism and diastrophism
The less-rigid layer of the earth's crust located beneath the plates
Zone of Divergence
The area where plates move apart, as at a mid-ocean ridge
Aone of Convergence
The area where one plate overrides another plate
Fracture Zone
The area where plates slide past one another--such as the San Andreas Fault
Extrusive Volcanism
When magma reaches the earth in molten form
Cinder Core
Mountain formed by materials expelled during an eruption which piled up near the vent
Shield Volcano
Mountain formed when lava flows cut from vents to create a large dome--such as Mauna Loa
Large volcano, such as Mexico's Popocatepetl, formed by alternate pyroclastic eruptions and lava flows
Plug Dome
A Mountain formed by the upward protrusion of a very stiff lava flow--such as Mount Lassen in California
Fissure Flow
Lava flow that forms plateaus, not mountains--as in eastern Washington and Oregon
Intrusive Volcanism
Magma that solidifies within the earth, often oxposed later and shaped by erosion