This document defines and describes different types of natural disasters including floods, tsunamis, storms, limnic eruptions, and cyclones. Floods are defined as overflow of water that submerges dry land. Tsunamis resemble rapidly rising tides rather than waves and arrive in wave trains. A limnic eruption occurs when carbon dioxide erupts from deep lake water, endangering wildlife. Cyclones are storm systems with low pressure and thunderstorms that produce strong winds and rain by feeding on heat from rising moist air.