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Chapter 7 Plate Tectonics Crossword Puzzle

Horizontales
The portion of the upper mantle just beneath the lithosphere, extending from about 100-350 km below the surface and consisting of weak, plastic rock where magma may form
A fracture that separates one plate from another
A plate boundary in which two plates move towards each other
A theory stating that the lithosphere is segmented into several plates that move about relative to one another by floating on and sliding over the upper mantle
A magnetic orientation the same as that of Earth's current magnetic field
The hypothesis proposed by Alfred Wegner that Earth's continents were once joined together and later split and drifted apart
A relatively small rising column of mantle rock that is hotter than surrounding rock
The concept of balance between gravity and buoyancy that causes the lithosphere to float on the asthenosphere at different elevations
An undersea mountain chain that forms at the boundary between divergent tectonic plates within oceanic crust
The hypothesis that segments of oceanic crust are separating at the Mid-Ocean Ridge
When all the continental tectonic plates are combined into a single landmass
Verticales
The process in which two lithospheric plates of different densities converge and the denser one sinks into the mantle beneath the other
A divergent plate boundary that can split apart continental crust
A plate boundary where two tectonic plates are sliding past one another
A plate boundary in which two plates move away from each other
A change in Earth's magnetic field in which the north magnetic pole becomes the south magnetic pole and vice versa, which has occured on average every 500,000 years over the past 65 million years.
The upward and downward flow of fluid material in response to density changes produced by heating and cooling which occurs slowly in Earth's mantle and much more quickly in the oceans and atmospheres