Earthquakes are extremely destructive, causing damage to property and triggering tsunamis, but they are also constructive forces creating mountains by the movement of tectonic plates. The earthquakes themselves are triggered by the movement of these plates, which causes movement and destruction on the Earth's surface.
Damage caused by earthquakes is well known; these destructive forces can be extremely deadly and can cause millions of dollars in damage to human property in addition to damaging the natural world. However, earthquakes aren't a solely negative force. They are also responsible for the creation of mountain ranges like the Himalayas.