Revelation 8:8-11
King James Version (KJV)
8And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea: and the third part of the sea became blood;

9And the third part of the creatures which were in the sea, and had life, died; and the third part of the ships were destroyed.

10And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters;

11And the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.