AWhensomeplates of the earth movesuddenly, an earthquake happens. Many earthquakes begin under the sea. In fact, earthquakes may happen anywhereon the earth. They often happen near mountains.During an earthquake,the shakings makerocks rise suddenly and even crack（断裂） open. Houses fall, people are killed or hurt, and sometimes whole villages or cities are destroyed.Can we do something to keep ourselves safe from earthquakes? Scientistshave studied earthquakes and mademapsth
