The word ‘tsunami’ can be translated from Japanese as ‘big wave’. It describes a natural process that can be dangerous for people and their homes. Most of the huge waves appear after earthquakes. Most waves are born in the Indian and the Pacific Oceans where volcanoes are active. The mass of water rises from the bottom of the ocean and moves to the shore. It moves at a speed of a plane and can be up to 40 meters high. The wave is very powerful and dangerous. In 2004, a tsunami happened in the Indian Ocean. It was one of most terrible natural disasters in history. It hit 14 countries bordering the Indian Ocean. Thousands of people were killed or went missing.