https://padlet.com/1718074/etgzeutlc4q2 joseph en-us 2017-03-20 18:00:46 UTC 2017-03-20 18:20:41 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/File.png 1718074 https://padlet.com/1718074/etgzeutlc4q2/wish/161282297 1.atmosphere:the envelope of gases surrounding the earth or another planet
2.troposphere:the lowest region of the atmosphere, extending from the earth's surface to a height of about 3.7–6.2 miles 
3 stratosphere .the layer of the earth's atmosphere above the troposphere, extending to about 32 miles 
4.]]> 2017-03-20 18:05:27 UTC https://padlet.com/1718074/etgzeutlc4q2/wish/161282297