Naturally occurring:
* Water (H₂O): Oxygen makes up a large portion of the water we drink.
* Air: The air we breathe is about 21% oxygen.
* Sand: Most sand is made of silica (SiO₂), which contains oxygen.
* Rocks: Many rocks contain minerals with oxygen, such as quartz (SiO₂), feldspar (various compositions including oxygen), and calcite (CaCO₃).
* Soil: Soil contains organic matter and minerals, both of which often contain oxygen.
* Plants and Animals: Oxygen is essential for life and is found in all living organisms.
Man-made:
* Paper: Paper is made from cellulose, which contains oxygen.
* Plastic: Many plastics contain oxygen in their chemical structure.
* Glass: Glass is often made from silica (SiO₂).
* Metals: Some metals are combined with oxygen to form oxides, such as iron oxide (rust).
These are just a few examples, and oxygen is actually a very common element found in many everyday materials.
