long period when there is little or no rain:

to cause to fill or become covered with water, especially in a way that causes problems:

the condition of being extremely poor:

(an event that results in) great harm, damage, or death, or serious difficulty:

to cause to fill or become covered with water, especially in a way that causes problems:

a sudden violent movement of the earth's surface, sometimes causing great damage:

changes in the world's weather, in particular the fact that it is believed to be getting warmer as a result of human activity increasing the level of carbon dioxide in the atmosphere:

damage caused to water, air, etc. by harmful substances or waste:

the state of having no food for a long period, often causing death: