Molecules of a single element can form different configurations, each configuration being called an allotrope. For the element oxygen, the two-atom form was also given the name oxygen. read more
This is made of ozone that is 3 oxygen atoms, it protects the surface form the sun's UV rays, humans are causing the ozone depletion. Ionsphere: Characteristics Lower part of the Thermosphere, Radio waves bounce back to the Earth's surface. read more