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It describes the difference between ancient gases and the breathable air humans rely on, then covers natural sources of pollution such as volcanic eruptions and lightning-caused forest fires. 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 \nSave the Air at School  \nA Final Word………………  \nGlossary………  \nIndex……………………………  \n………………………………6  \n…………………………8  \n………………………………13  \n…………………………20  \n………………………30  \n…………………31  \n…………………………32  \n# INTRODUCTION\n\nMost people don't think much about the air theybreathe.But from the moment we’re born,weinhale an average of 3,000 gallons of air a day.Humans can live weeks without food and dayswithout water but only a few minutes without air.  \nHumans breathe air for the oxygen it contains.Our lungs transfer the oxygen we take in to ourblood.Our heart pumps the oxygen-rich bloodthroughout our bodies to feed all of our cells.Theunused part of the air is exhaled.Even fish needoxygen to live.They process the oxygen found inwater through their gills.  \nHuman beings are the only creatures who canpollute the air.Human beings also are the onlyones who can reverse the effects of pollution.Ifwe want to save the earth,we must begin in ourown lives.If we don't take action,the air willonlyget worse for our children and grandchildren.  \nThis book will tell you about air pollution andwhat things you can do to help clean the air.  \nMany are simple things you can do every day,and  \nIt won't happen immediately,but it will happen.We must remember it took many years for the airto become as polluted as it is now.  \n# CHAPTER 1\n\nThe Beginnings ofOur Atmosphere  \nMillions of years ago,the earth was very differentfrom the way it is today.Most scientists believeair as we know it did not exist then.Instead,between the land and outer space were manygases all swirling together.But there was nooxygen for living organisms to breathe.  \nLittle by little,air developed.As rays of sunlightinteracted with the gases,oxygen and nitrogenwere formed.These are the primary componentsof the air we breathe.After many years,the gasesabove the earth contained the right elements tosupport plants and animals.  \nBut even in prehistoric times,the air was notcompletely pure.Ancient volcanoes erupted andsent streams of hot gases and molten rock intothe air.Bolts of lightning started forest fires,which filled the air with smoke.  \n6","cbCaif2ZLoVVsTNF","https://ap.wps.com/l/cbCaif2ZLoVVsTNF","pdf",2928220,38,"English","# Introduction\n# Chapter 1\n## The Beginnings of Our Atmosphere\n# Chapter 2\n## Air Pollution Throughout History\n# Chapter 3\n## Air Pollution Today\n## Acid Rain\n## Ozone\n## Global Warming\n## Toxic Chemicals\n# Chapter 4\n## Air Pollution -What Can You Do\n## Save the Air at Home\n## Save the Air in Getting from Here to There!\n## Save the Air at School\n## A Final Word\n# Glossary\n# Index","[{\"question\":\"Why is breathing air essential for humans?\",\"answer\":\"Humans need air because their lungs transfer the oxygen to the blood, which is pumped throughout the body. Without air, survival lasts only minutes.\"},{\"question\":\"How did oxygen and nitrogen come to exist in the atmosphere?\",\"answer\":\"Scientists believe sunlight interacting with ancient gases formed oxygen and nitrogen. Over many years, the gases developed the right elements to support life.\"},{\"question\":\"What natural events could pollute the air in prehistoric times?\",\"answer\":\"Volcanoes erupted and released hot gases and molten rock, while lightning started forest fires that filled the air with smoke.\"}]","THE AIR WE BREATHE - Chapter 1 - The Beginnings of Our Atmosphere | PDF",1790701084,59]