Earthquakes.

An earthquake is like when two blocks of the earth move past each other and the surface slips and this is called a "fault". Then sometimes the earth has foreshocks. while the earth is shaking when there is a earthquake the edges of the plates are stuck together, the blocks are still moving and the energy that causes the blocks to move pass each other is being stored up. Earthquakes are natrual disasters that can kill millions of poeple and also distroy cities and countries. An earthquake occurs when plate grinds and hit each other.

While an earthquake errupts the ground shakes and cracks in the earth being to form. Scientist or People use seismographs to record earthquakes. When they record a earthquake the seismograph shakes on the ground along with the Earthquake but the hanging weight does not shake with it. Scientists cannot predit when a earthquake is gonna happen soon because they have tried many different ways to predit when a earthquake is gonna happen but it never been successful. They say earthquakes are caused by "Plate Tectonics".