What causes earthquakes?Earthquakes happen when rocks underground suddenly break or move due to built-up pressure. This usually occurs along faults, where Earth's plates push against each other. How does magnitude affect damage?The higher the magnitude, the stronger the earthquake. Bigger earthquakes cause more shaking, which can lead to more damage to buildings, roads, and people’s safety. What happens when an earthquake occurs underwater?When an earthquake happens underwater, it can create huge waves called tsunamis. These waves can travel fast and flood coastal areas, causing destruction.