Usually a word or concept can be defined in just one sentence. A definition essay, however, needs to be several paragraphs. Therefore, the definition must be extended to include examples, details, personal experience, description, causes, effects, analysis, etc.
Global Warming Causes More Hurricanes. It could be that the tropical oceans will become warmer with a simultaneous decrease in upper atmosphere temperature, which will cause stronger convection, which will help tropical storms to become more organized and stronger so there will be stronger hurricanes.
The effects of hurricanes can be grouped into two: weather and economic. Hurricanes bring about storm surges. The powerful spiral wind action carries water a couple of feet high and lashes it ashore. This can destroy structures and items very close to the shore.