Although the concentration of the ozone in the ozone layer is very small, it is vitally important to life because it absorbs biologically harmful ultraviolet (UV) radiation coming from the sun. Extremely short or vacuum UV (10â100 nm) is screened out by nitrogen.
Lightning strikes reach the ground on Earth as much as 8 million times per day or 100 times per second, according to the National Severe Storms Laboratory. Out of all the lightning strikes in the world, the United States accounts for about 20 million of the total number of lightning strikes each year. Continue Reading.
View full size image. There's a club open to people from all around the world, but you wouldn't want to join: The club is exclusively for people who've survived a lightning strike. Lightning strikes kill about 24,000 people worldwide each year, and about 240,000 people are injured by lightning and survive.