Question

what are some things that can happen when an ocean plate collides with a continental plate?

Explanation:

When an ocean plate collides with a continental plate, the denser oceanic plate subducts (dives beneath) the less - dense continental plate. This subduction can lead to several geological phenomena.

• Volcanic activity: As the subducting oceanic plate descends into the mantle, it heats up and releases water. This water lowers the melting point of the overlying mantle material, causing partial melting. The molten rock (magma) then rises to the surface, forming volcanoes. For example, the Cascade Range in the north - western United States is formed due to the subduction of the Juan de Fuca plate beneath the North American plate.
• Earthquakes: The movement of the subducting plate and the overriding continental plate is not smooth. Friction causes stress to build up. When this stress is released suddenly, it results in earthquakes. The 2011 Tohoku earthquake in Japan was associated with the subduction of the Pacific plate beneath the Okhotsk plate (a part of the North American plate in this context).
• Formation of mountain ranges (in some cases): Although mountain ranges are more commonly associated with continental - continental collisions (like the Himalayas), the accretion of material (such as sediments scraped off the subducting plate) can contribute to the growth of continental margins and, over long periods, may play a role in the development of larger - scale mountainous regions.

Answer:

Volcanic activity, earthquakes, and (in some cases) the accretion of material that can contribute to the growth of continental margins (which may be a precursor to more extensive mountain - building over long geological timescales).