Earthquakes
Volcanos burn
Lightning
In terms of human deaths accountable to each, earthquakes are way ahead.
A number of reasons. There are far fewer major volcanic eruptions than there are earthquakes. Earthquakes have no warning. Most volcanos give warning signs before a major eruption. Earthquakes affect far larger areas, and those areas are more likely to have people living in them. Unless you are near a volcano, *and* in the path of a pyroclastic flow, a blast, or are two stupid to get out of the way of a lava flow, they are unlikely to kill you.
Its the study of the movement of the earths tectonic plates, so to do with earthquakes, volcanos, tsunamis etc. Its more geography really.
Earthquakes
The activity kills more people in Britain is Fishing
Overall it appears that lightgning kills more people annuall.
Seismology is an Earth Science that studies earthquakes and the movement of waves through the Earth. It includes the study of tsunamis, volcanos and plate tectonics. You can read more about Seismology and Earth Sciences at the links provided below.
Hippos
tramps
they have more earthquakes in other people depending on the faults and plates around the world.