gases, asphyxiating and poisonous

"Follow along with Sophia as she learns about pollution using the Next Generation Science Standards."--Provided by publisher.

Relates the fascinating-and appalling-stories of the discovery, development, applications, and occupational and public health hazards of natural and human-made gases. Some of these gases have figured in mass extinctions. Others have created havoc through their use in chemical warfare or their accidental release. Colorful accounts capture the characteristics and history of each of these mysterious substances, focusing on key episodes in scientific discovery and exploration since WWI.