🔍 Key Concepts

• Difference between stratospheric ozone and regular oxygen gas in the air we breathe • Chemical symbols for oxygen atoms and molecules (O, O₂, O₃, etc.) • Where the ozone layer is and what kind of oxygen molecule it is made of

💭 Think About

• Recall what form of oxygen is commonly written as O₂ and what we normally breathe at sea level. • Think about the special form of oxygen that absorbs harmful ultraviolet (UV) radiation—how is that usually written in chemistry notation? • Match the chemical notation for ozone to how many oxygen atoms must be bonded together to make that molecule.

✅ Before You Answer

• Be clear on the difference between O, O₂, and O₃ before choosing. • Confirm which of these forms is specifically called ozone in environmental and maritime safety materials. • Make sure the number you pick matches the way ozone is written in chemistry (for example, O followed by a subscript number).