The Earth is 70% ocean.
If you mean "where" earthquakes and volcanoes are most likely to occur it is in what's called the "ring of fire" which is the coastal ring around the Pacific Ocean.
The answer is that earthquakes and volcanoes are most frequent along Tectonic plate boundaries, these are the natural pieces that the continents and oceans are on.
Earthquakes and volcanoes both occur in land and ocean. =)
they are most likely to happen on the plate boundaries which are located at the edge of the continents. (or some are in the ocean)
Pacific
Pacific Ocean
earthquakes and volcanoes
yes
The Japanese archipelago is located in an area where several continental and oceanic plates meet. This is the cause of frequent earthquakes and the presence of many volcanoes and hot springs across Japan. If earthquakes occur below or close to the ocean, they may trigger tidal waves (tsunami).
The Ring of Fire
The Ring of Fire
Plate tectonics.