2.Every country in the world sits on top of a large sheet of rock. Earthquakes are caused by the movement of these sheets of rock and are measured on the Richter Scale. But each year there are about eighteen which measured on the Richter Scale. But each year there are about earthquakes which measure between 7 and 7.9 .These are major earthquakes . The earthquake that destroyed kobe measured 7.2 on the Richer Scale . The earthquake in Haiti measure 7 on the Richter Scale .Geologists knew that two sheets of rock met and formed a sixty – five kilometer fault line near Port - -au –Prince. After the earthquake, they discovered that the two sheets of rock had moved nearly 2 metres in opposite directions against each other .