There are six different types of tornadoes. The most commonly recognized type is the supercell tornado, the type that causes massive destruction. A gustnado is the opposite; it is very weak. It causes leaves and other de... More »

Using the Enhanced Fujita (EF) scale, a tornado can have wind speeds of more than 200 miles per hour. The EF scale categorizes tornadoes based on the extent of damage they cause and are not actual wind speed measurements... More »

According to infoplease, tornadoes can cause very minimal damage, such as ripping siding off of homes, to catastrophic damage, which can literally lift homes off their foundations. The type and severity of tornadoes are ... More »

Hurricanes and tropical storms, tornadoes, floods and wildfires are common natural disasters. Earthquakes, heat waves, droughts and thunderstorms are also disasters. Hurricanes and tropical storms are some of the most da... More »

According to, there are five major terrain features: hill, ridge, valley, saddle and depression. Variations and combinations of these terrain types make up the topography of the Earth. More »

Types of structures that are not sedimentary are metamorphic and igneous. These structures are categorized based on their origins by geologists. More » Science Earth Science

The different types of island are tidal islands, continental islands, barrier islands, oceanic islands and coral islands. Continental islands are formed at the edges of continental shelves. When continents break apart, p... More »