In the book of Revelations what happened when the third of seven trumpets sounded?

ANSWER

A star named wormwood turned the waters bitter

Revelation 8 :

(10) The third angel sounded his trumpet, and a great star, blazing like a torch, fell from the sky on a third of the rivers and on the springs of water— (11) the name of the star is Wormwood. A third of the waters turned bitter, and many people died from the waters that had become bitter.
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