Eruption - process emissions volcano on the Earth's surface hot debris, ash outpouring of magma, which izlivshis on the surface, it becomes lava. Eruption may have a time period ranging from several hours to many years.
Interesting fact: On Earth, about 1500 active volcanoes, not counting submarines. Of these, only erupt each year.
Earthquake - is any wobble in the Earth surface due to natural causes, among which the main role belongs to tectonic processes (mass transfer inside the Earth). It is a common phenomenon observed in many areas of continents and on the ocean floor.
Interesting fact: In the main earthquakes happen because of geological problems, but sometimes they can be caused by landslides, explosions in mines, nuclear tests and volcanic activity.