Read the statements and choose the correct definition of the word "wildfire".

• It's a very big fire that spreads quickly and burns natural areas like woods, forests and grassland.
• It's an extremely large wave in the sea caused, for example, by an earthquake.
• It's a mass of earth or rock that falls down the slope of a mountain or a cliff.
• It's a a large amount of water covering an area that is usually dry.