Final answer:
A plateau can form due to uplift from tectonic forces, basaltic lava accumulating from crustal cracks, or the erosion of mountains leaving a flattened surface.
Step-by-step explanation:
Plateau formation can occur through several geological processes. Events that could have caused this plateau to form include uplift that raises the level of a piece of crust, often as a result of tectonic forces. For example, during continental collision, the added weight of the continental mass will cause the lithosphere to bend, creating a foreland basin which can elevate adjacent areas into a plateau.
Seafloor spreading is typically associated with the creation of new oceanic crust and the widening of ocean basins, not the formation of plateaus. Similarly, convection and subduction are associated with the movement of tectonic plates and can lead to the creation of mountain ranges or ocean trenches, but are not direct causes of plateau formation.