The correct answer is option 1, Earthquake. An earthquake is an unpredictable natural disaster that occurs when the Earth`s tectonic plates shift and release energy, causing the ground to shake. Unlike other options, such as cyclones, tornadoes, and hurricanes, which can often be predicted and tracked using advanced meteorological technology, earthquakes do not have a reliable method of forecasting. Therefore, their occurrence is generally unexpected and can happen without any warning signs. Earthquakes can have devastating effects, causing buildings to collapse, landslides, and tsunamis, making them highly unpredictable and dangerous. It is important for communities in seismically active areas to have emergency plans in place to mitigate the impact of earthquakes and ensure the safety of their residents.