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Plate Tectonic

Across
The mineralized remains of organisms, showing how long-dead organisms lived and how their bodies were structured.
The solid layer with plasticity in the upper mantle that is located just below the lithosphere; lithospheric plates "float" and move on this layer.
A parallel pattern of rock material found at identical locations on each side of the Mid-Atlantic Ridge reveals rock of the same geologic age and polarity.
A cyclical motion occurs because of density differences in the mantle. Heated, less dense lower regions of the fluid mantle rise, and denser, cooler regions sink due to gravity. The combined motions serve as the engine for crustal plate movement.
Deep and narrow depressions in the seafloor where the sub-ducted plate moves into the asthenosphere.
The boundary between two plates that slide past one another--sudden shifts that result in major geological events such as earthquakes and the release of stored energy.
The boundary between two tectonic plates moving toward each other resulting in volcanic activity when a denser ocean plate sub-ducts, or moves below a continental plate or another oceanic plate.
Down
The process in which a denser plate is pushed downward beneath a less dense plate when plates converge; occurs at continental to oceanic boundaries and oceanic to oceanic boundaries.
Cool, rigid, outermost layer of Earth that is divided into enormous pieces called tectonic plates consists of the crust and the rigid uppermost part of the mantle.
The theory that continents were once connected but have drifted apart.
That the lithosphere is divided into tectonic plates that slowly move on top of the asthenosphere.
A major geological event; occurs when continental plates of equal density converge.
Occurs when two tectonic plates move away from each other.