Final answer:
The collision between an oceanic crust plate and a continental crust plate likely leads to subduction, causing volcanic eruptions and earthquakes. Mountain formation is more typical in continent-continent collisions.
Step-by-step explanation:
When an oceanic crust plate collides with a continental crust plate, the most probable outcome is subduction. In a subduction zone, the denser oceanic plate is forced beneath the lighter continental plate into the upper mantle. This causes the oceanic plate to melt due to high pressure and temperature, and the material is recycled into the mantle. This process often leads to the formation of volcanic eruptions as the melted material rises to the surface through the overlying plate. Additionally, earthquakes are common around subduction zones due to the movement of the plates. While the formation of mountains can occur due to tectonic activity, it is more characteristic of continent-continent collision rather than oceanic-continental collisions.