1BR 1-4 Air is around you

Hello I read this book today. I choice this because I was interested in a air.

This says air is exist everywhere in the earth and we can not see them. But there are. And a interesting point in this book is that a test in. The test is to prove air is there. I will try that test some day. And this book also says the air weighs a lot-5　quadrillion tons. That's pretty amazing, huh?

MMmmmm... That's it! This was good book!

See ya!!!!

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