一:Earthquake: The Unpredictable Disaster Earthquakes are natural disasters that can strike at any time and without warning. They occur when the tectonic plates (地壳板块) in the Earth's crust (地壳) move suddenly. This movement causes the release of energy in the form of seismic waves (地震波). Here are some key points about earthquakes. The Causes of Earthquakes Earthquakes are mainly caused by the movement of tectonic plates. These plates float on a layer of molten rock (熔岩层) beneath the Earth's surface. When the plates rub against each other or move apart, they create stress. When this stress exceeds the strength of the rock,