Oxygen makes up only about 21 percent of the air we breathe, but it plays a much bigger role in holding life together and keeping our world intact. Imagine if, just for five seconds, all the oxygen on Earth disappeared.
Five seconds may not sound like much. Most people can hold their breath that long without thinking twice. But the planet itself? It would not take it so lightly.
Here are six terrifying things that would instantly happen if Earth lost oxygen even for just a few seconds.