Earthquake Earthquakes occur throughout the world, but the vast majority occur along narrow belts which are a few tens to hundreds of kilometres wide. These belts mark boundaries on the planet's surface that are very active geologically. An earthquake occurs when rocks break under the stress created by the constant movement and collision of the thin jigsaw-like tectonic plates found at the surface of the Earth. Click here for more info »

Flood A flood is an overflow of an expanse of water that submerges land. Flooding may result from a body of water, such as a river or lake, exceeding the total capacity of its boundary, with the result that some of the water flows or sits outside of the normal perimeter of the body. It can also occur in rivers, when the strength of the river is so high it flows right out of the river channel, particularly at corners or meanders. Click here for more info »

Storm A storm is an aggravated state of the atmosphere, especially affecting its surface, and creating severe weather. It may be marked by strong wind, thunder and lightning (a thunderstorm), heavy precipitation, such as ice (ice storm), or wind transporting some substance through the atmosphere (as in a dust storm, snowstorm, hailstorm, etc). Click here for more info »