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.
Volcanoes are more likely to happen along the boundaries of tectonic plates, such as the Ring of Fire around the Pacific Ocean, where plates collide or separate, allowing magma to rise to the surface. This is where most of the Earth's volcanoes are located.
Earthquakes and volcanoes both occur in land and ocean. =)
Earthquakes are likely to occur along tectonic plate boundaries where there is movement and stress in the Earth's crust. Volcanoes are likely to occur at convergent plate boundaries, divergent plate boundaries, and hotspots where magma from the Earth's mantle reaches the surface.
Pacific
Pacific Ocean
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).
earthquakes and volcanoes
yes
The Ring of Fire
Plate tectonics.
The Ring of Fire