the process by which new oceanic lithosphere (sea floor) forms as magma rises to earth's surface and solidifies at mid-ocean ridge
SEA-FLOORSPREADING
the theory that explains how large pieces of the lithosphere
PLATETECTONICS
the solid, outer layer of earth that consist of the crust and the rigid upper part of the mantle
LITHOSPHERE
the solid, plastic layer of the mantle beneath the lithosphere
ASTHENOSPHERE
the boundary between tectonic plates that are moving away from each other
DIVERGENTBOUNDARY
the boundary between tectonic plates that are cooling
CONVERGENTBOUNDARY
the boundary between tectonic plates that are sliding past each other horizontally
TRANSFORMBOUNDARY
the hypothesis that states that the continents once formed a single ladness
CONTINENTALDRIFT
the process by which new oceanic lithosphere (sea floor) forms as magma rises to earth's surface and solidifies at mid-ocean ridge
SEA-FLOORSPREADING
the process by which earth's crust breaks apart
RIFTING
a major area in the basin of the pacific ocean where a large number of earthquakes and volcanic eruptions occur
PACIFICRINGOFFIRE
the lithosphere of the earth that is divided into a small number of plates which float on and travel independently over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates
TECTONICPLATES
the super continent that formed 300 million years ago and that began to break up beginning 250 million years ago
PANGAEA
the study of the alignment of of magnetic minerals in rock
PALEOMAGNETISM
a crack, split, or break in something
RIFT
the relatively thick layer of earth's crust that forms the large land mass
CONTINENTALCRUST
a piece of lithosphere that has a unique geologic history and that may be part of a larger piece of lithosphere
TERRANE
a ring-shaped coral reef, island, or series of islands
ATOLLS
a process by which material is added to tectonic plate or a landmass
ACCRETION
about 4 miles thick composed of several layers not including the overlying sediment
RIFT