![]() Earthquakes are extremely common.Ĭopy Table 2 into your notebook and fill in the missing quantities. Two plates slide past one another, moving in opposite directions or in the same direction at different rates. This is the boundaries where subduction occurs (one plate being forced under another) Transform Boundary an area where two tectonic plates are sliding past each other. These boundaries typically result in Volcanic Island Arcs and mountain ranges. ![]() These boundaries typically result in mid-ocean ridges, rift valleys, and fault block mountains Convergent Boundary an area where two tectonic plates are moving towards each other. Divergent boundary an area where two tectonic plates are moving away from one another. The surface around a volcano's opening can grow into a mound or cone shape as successive eruptions send more lava onto the surface, where it cools into hard rock. This can result in a change, over time, to the chemical composition of the lava as well. This plumbing system can become more complex over time. The magma rises through a system of pipes or channels, sometimes spending time in chambers where it bubbles with gas and undergoes chemical transformations. volcano A place on Earth's crust that opens, allowing magma and gases to spew out from underground reservoirs of molten material. Upwelling The process by which material rises from Earth's middle layer into its outer layer, where it will become part of the tectonic plates.
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