No.... the weight of a substance is the mass of the substance multiplied with the acceleration due to gravity on it.
Flash floods are limited in area, occur with little warning, are most common with intense rainfall
The answer is Permian-Triassic extinction.
The Permian-Triassic extinction was 252 million years ago. It is known as The Great Dying because about 95% of all species died out due to environmental changes (volcanic eruptions, dry climate, melting of ice sheets, etc). This is also the only event in which many insect species wiped out.
