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OZONE LAYER
In the past couple of years you may have heard of something called ozone. It is a compound that floats in the atmosphere around the Earth. Did you know that ozone is made up of oxygen? That's right. Three oxygen atoms can combine and make ozone.
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PLASTICS
Oxygen is inside things made out of plastic. Every time you get a 2-liter bottle or a yogurt, look at the plastic. Now you know there is oxygen inside all plastics.
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BREATHABLE AIR
Oxygen is very important. Life on Earth could not exist without it. Animals need to breathe oxygen to survive. Luckily, there is enough oxygen in the air for everyone to breathe.
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ROCKS AND SOILS
You just read that there is oxygen in the air. Here's something else... 50% of the Earth's crust is made up of oxygen. That means that no matter what you pick up or dig up from the ground... There's a good chance that one half of it is made up of oxygen.
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WATER
Over half of the Earth is covered with water. Mixed in that water is oxygen. In the same way we breathe the oxygen in the air, fish breathe the oxygen in the water.
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