1. Volcanic Eruption
1.1. What is a Volcanic Eruption
1.1.1. Eruptions can come from side branches or from the top of the volcano. Some eruptions are terrible explosions that throw out huge amounts of rock and ash and kill many people. Some are quiet outflows of hot lava. Several more complex types of volcanic eruptions have been described by volcanologists. These are often named after famous volcanoes where that type of eruption has been seen. Some volcanoes may show only one type of eruption during a period of activity, while others may show a range of types in a series.
1.1.2. A volcanic eruption occurs when hot materials are thrown out of a volcano. Lava, rocks, dust, ash and gas compounds are some of these "ejecta".
2. Hurricane
2.1. What is a hurricane
2.1.1. A storm with a violent wind, in particular a tropical cyclone in the Caribbean.
2.1.2. A wind of force 12 on the Beaufort scale (equal to or exceeding 64 knots or 118 km/h).
2.1.3. Synonym: cyclone, typhoon, tornado, storm, tropical storm, tempest, windstorm, superstorm, gale, squall, whirlwind.
3. Tsunami
3.1. What is a Tsunami
3.1.1. A long, high sea wave caused by an earthquake or other disturbance.
3.1.2. An arrival or occurrence of something in overwhelming quantities or amounts.
4. Earthquake
4.1. Around the world
4.1.1. In Greece
4.1.2. In Spain
4.1.3. In Iceland