There are around the world hundreds of eruptions every year. We don’t know about them because for the most part they happen under water. If you have never seen the films of these eruptions I would suggest you try to hunt one down because it is a very weird thing to see steam created on the seabed.
It is interesting about these eruptions that molten lava forms and geologists have worked out that the sea beds around the world expand because of this activity stretching out about an inch or so every year. Which is even more interesting because if the seabeds are pushing themsleves outwards how come continents stay pretty well fixed moving at a much, much slower rate of an inch a century?
This perplexed scientists for quite a while. Until they looked more closely as the density of magma and what happens to it as it erodes away and air gets into it. It forms granite that heaviest of rocks as any farmer who has had to clear a few pieces from their land will know. The thing is relative to the magma is it much lighter. And granite and other rock strata that forms the ‘bedrock’ of continents float. The seabed expands, pushes against the continents and slides under them.
Oh how different the world looks through other’s eyes!