discontinuity (seismic) (172): Boundaries where seismic waves experience an abrupt change in velocity or direction. divergent plate boundary (185): Develop when two plates move away from each other. May manifest themselves as mid-oceanic ridges complete with tensional (pull-apart) geologic structures. The rending of the crust is accompanied by earthquakes and enormous outpourings of volcanic materials that are piled high to produce the ridges itself. An upfold in rocks having the general configuration of an inverted bowl. Strata in a dome dip outward and dome (211): downward in all directions away from a central area. exotic terrane (204): Small patches of the crust that may become incorporated into the crumpled margin of larger continent. fault (205): A fracture in the Earth’s crust along which rocks on one side have been displaced relative to rocks on the other side. Bends in rock strata that are evidence of crustal movement. Metamorphic action due to the compressional fold (206): force. Tend to occur like a series of petrified wave crests and troughs. footwall (205): In normal faults, the mass of rock that lies below the shear plane. It appears to move upward relative to the opposite side or hanging wall. In reverse faults, the footwall appears to move downward relative to the hanging wall. Glossopteris flora (181): An assemblage of fossil plants found in rocks of Late Paleozoic and early Triassic age in South Africa, India, Australia, and South America. The flora takes its name from the seed fern Glossopteris. Gondwana (178): The great Permo-Carboniferous continent of the southern hemisphere, which comprised the assembled present continents of South Africa, India, Australia, Africa-Arabia, and Antarctica. gravity anomaly (201): The difference between the observed of gravity at any point on the Earth and the calculated theoretic value. Gutenberg discontinuity (185): The boundary separating the mantle of the Earth from the core below. The Gutenberg discontinuity lies about 2900 kilometers below the surface. (189): Submerged mountains with flat, rather than conical, summits.
discontinuity (seismic) (172): Boundaries where seismic waves experience an abrupt change in velocity or direction. divergent plate boundary (185): Develop when two plates move away from each other. May manifest themselves as mid-oceanic ridges complete with tensional (pull-apart) geologic structures. The rending of the crust is accompanied by earthquakes and enormous outpourings of volcanic materials that are piled high to produce the ridges itself. dome (211): An upfold in rocks having the general configuration of an inverted bowl. Strata in a dome dip outward and downward in all directions away from a central area. exotic terrane (204): Small patches of the crust that may become incorporated into the crumpled margin of larger continent. fault (205): A fracture in the Earth’s crust along which rocks on one side have been displaced relative to rocks on the other side. fold (206): Bends in rock strata that are evidence of crustal movement. Metamorphic action due to the compressional force. Tend to occur like a series of petrified wave crests and troughs. footwall (205): In normal faults, the mass of rock that lies below the shear plane. It appears to move upward relative to the opposite side or hanging wall. In reverse faults, the footwall appears to move downward relative to the hanging wall. Glossopteris flora (181): An assemblage of fossil plants found in rocks of Late Paleozoic and early Triassic age in South Africa, India, Australia, and South America. The flora takes its name from the seed fern Glossopteris. Gondwana (178): The great Permo-Carboniferous continent of the southern hemisphere, which comprised the assembled present continents of South Africa, India, Australia, Africa-Arabia, and Antarctica. gravity anomaly (201): The difference between the observed of gravity at any point on the Earth and the calculated theoretic value. Gutenberg discontinuity (185): The boundary separating the mantle of the Earth from the core below. The Gutenberg discontinuity lies about 2900 kilometers below the surface. (189): Submerged mountains with flat, rather than conical, summits.
Ch07%20Plate%20Tectonics%20Underlies%20All%20Earth%20History%20Notes.docx