Asthenosphere - The solid layer with plasticity in the upper mantle that is located just below the lithosphere; lithospheric plates “float” and move on this layer., Continental–Continental Boundary - The boundary between two continental tectonic plates; forms mountain ranges, Continental–Oceanic Boundary - The boundary between the continental and oceanic crusts; the collision causes the oceanic plate to move underneath the continental plate, forming trenches., Convergent Boundary - A place where two tectonic plates move toward each other and collide, Divergent Boundary - The boundary between two tectonic plates moving away from each other, creating rift valleys on land, new ocean crusts on sea floors, and mountainous ridges, Lithosphere - The outermost part of Earth, comprising the crust and the uppermost part of the mantle, Oceanic–Oceanic Boundary - The boundary between two oceanic crusts; the collision causes one oceanic plate to move underneath another, forming trenches and a line of volcanoes and islands., Plate Boundary - The place where two different plates make contact, Plate Tectonics - The theory that the lithosphere is divided into tectonic plates that slowly move on top of the asthenosphere, Transform Boundary - A place where two tectonic plates slide past each other, Radioactive Dating - Technique used to determine how old a rock is by analyzing the amounts of a radioactive isotope and its decay products in the rock, Relative rock dating - the comparison of one rock or fossil to another to determine which one is older or younger, Fossil - the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.,

Plate tectonics

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