📝 提交该分类网址

📁 AcidRain

Acid rain is caused when certain chemicals are released into the atmosphere, chemically react, and fall as rain or snow. Acid rain has a pH that is much lower than normal rainwater. pH measures if a substance is an acid or a base.

条目 (1+)

全部 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Wikipedia: Passenger Pigeon

http://en.wikipedia.org/wiki/Passenger_Pigeon

👍 0 详情链接