A natural disaster is a major adverse event caused by natural processes of the Earth, such as floods, earthquakes, volcanic eruptions, and tsunamis. Floods occur when a body of water, such as a river or lake, overflows its usual boundaries onto land that is not normally submerged. The primary effects of flooding include loss of life, damage to buildings and infrastructure, and economic hardship from rebuilding costs and loss of tourism. Precautions during a flood include not walking or driving through floodwaters and avoiding contact with electrical equipment when wet. A drought is a prolonged period of below average precipitation that can last months or years and severely impact local ecosystems and agriculture. The effects of drought include restrictions on water supply