1.According to the National Earthquake Information Center, about 1.4 million earthquakes happen every year. The large
majority are micro quakes, measuring less than 3 on the Richter scale.
2.Scientists had been studying phenomena like volcanoes and earthquakes for years and finally broke through with the
theory of plate tectonics in the mid-20th century.
3.Earthquakes kill about 8000 people a year.
4.When two plates move away from each other, magma (molten rock) seeps up through the crack.
5.There are four types of fault: normal, reverse, thrust and strike-slip.