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Transform Boundary: Two plates slide sideways past each other. Crust is neither created or destroyed here. This type of boundary results in earthquakes rather than volcanoes.
Divergent Boundary: Two plates move away from each other as new ocean crust is created in the center where magma is rising between the two. Rift valleys and fault block mountains form at this type of boundary.
Convergent Boundary: Two plates with continental crust towards each other. As they collide they cause the continental crust to buckle and push upwards creating folded mountains. Because continental crust is too light to sink they will just bunch together and create mountains. These folded mountains are one of the key pieces of evidence Alfred Wegener used for his Theory of Continental Drift.
Ocean to Ocean Subduction Boundary: Two plates composed of oceanic crust come together. Because oceanic crust is more dense one of the plates will start to slide below the other one and go back into the hot mantle where it starts to melt. Island Arcs, made from under water volcanoes will start to form on the ocean plate that is not sinking.
Ocean to Ocean Subduction Boundary Video also a video about why Island Arcs form curved instead of in straight lines.
Ocean to Continent Subduction Boundary: When an plate with oceanic crust collides with a plate made from continental crust, the oceanic crust will ALWAYS sink underneath and back into the mantle. As the sinking ocean crust melts it will create a chain of Composite Volcanoes on the surface of the plate above it.
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