Chs. 19, 20, And 21 Science Terms

Front 1

Orogenesis

Back 1

Massive structural changes in the earth's crust -- the entire mountian building process

Front 2

Volcanism

Back 2

The movement of magma within the earth's crust, sometimes coming to the surface

Front 3

Diastrophism

Back 3

Solid rock materials bent or broken by the pressure of the crust

Front 4

Plate Tectonics Theory

Back 4

An explanation of the origins of volcanism and diastrophism

Front 5

Asthenosphere

Back 5

The less-rigid layer of the earth's crust located beneath the plates

Front 6

Zone of Divergence

Back 6

The area where plates move apart, as at a mid-ocean ridge

Front 7

Aone of Convergence

Back 7

The area where one plate overrides another plate

Front 8

Fracture Zone

Back 8

The area where plates slide past one another--such as the San Andreas Fault

Front 9

Extrusive Volcanism

Back 9

When magma reaches the earth in molten form

Front 10

Cinder Core

Back 10

Mountain formed by materials expelled during an eruption which piled up near the vent

Front 11

Shield Volcano

Back 11

Mountain formed when lava flows cut from vents to create a large dome--such as Mauna Loa

Front 12

Stratovolcano

Back 12

Large volcano, such as Mexico's Popocatepetl, formed by alternate pyroclastic eruptions and lava flows

Front 13

Plug Dome

Back 13

A Mountain formed by the upward protrusion of a very stiff lava flow--such as Mount Lassen in California

Front 14

Fissure Flow

Back 14

Lava flow that forms plateaus, not mountains--as in eastern Washington and Oregon

Front 15

Intrusive Volcanism

Back 15

Magma that solidifies within the earth, often oxposed later and shaped by erosion