The plates move because earthquakes are made by the plates. Also the land loses 1 cm. a year. that is proof that the plates move.
they can kill many people with the lava and the ash can choke you to death.
earthquake can split roads and make building fall and kill many people.
tsunami are very dangerous because when the waves come the wipe every thing away.
Running Water, Wind, and Ice
What type of erosion causes the most changes with earth.
I think that running water is the worst because it can cause many problems like tsunami and mud slides like the one Washington state.