Why does the Earth tremble sometimes?

The moving tectonic plates, in which the uppermost layer of the Earth is divided, not only collide at the many places but also often slide fast each other. This causes friction and leads to problems once in a while. Stress builds up, which then gets discharged very quickly. There is a jerk-the Earth 🌎trembles. This gives rise to shock waves that can cause a lot of damage at places, depending on the intensity of the earthquake and where they occur. Luckily, to some extent we can protect ourselves from these waves. A tsunami occur if the centre of the earthquake lies below the sea.