1) The ancient city of Pompeii was preserved under layers of volcanic ash after the eruption of Mount Vesuvius in 79 AD, providing valuable insights into Roman life.

2) In Norse mythology, Ragnarok is a cataclysmic event that signifies the end of the world. It involves a series of apocalyptic battles and natural disasters, leading to the destruction of the gods and the world as it is known. From the ashes, a new world and a new generation of gods emerge.

3) The International Monetary Fund (IMF) and the World Bank are international financial institutions that work to promote global financial stability and economic development.

4) Cyclones are fueled by warm ocean waters and atmospheric conditions that allow the formation of thunderstorms.