Tornadoes are natural events that many people find both frightening and intriguing. The word “tornado” derives from the Spanish words “tornar,” which means “to turn,” and “tronada,” which means thunderstorm. People can recognize tornadoes by their funnel shape, which consists of violently rotating winds. These winds can reach up to 200 to 300 mph in the strongest of tornadoes and cause severe damage to towns or cities.
A tropical cyclone is a rotating low-pressure weather system that has organized thunderstorms but no fronts (a boundary separating two air masses of different densities). Tropical cyclones with maximum sustained surface winds of less than 39 miles per hour (mph) are called tropical depressions. Those with maximum sustained winds of 39 mph or higher are called tropical storms.
The pollution from the Industrial Revolution darkening the trees. After the trees darkened from all the soot in the air, the white moths were easier to see and more vulnerable to predators. The dark moths blended into the dark tree bark.
