Revelation 8:8 KJV
And 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;
Revelation 8:6–10 KJV Chapter Context
6
And the seven angels which had the seven trumpets prepared themselves to sound.
7
The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up.
8
And 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;
9
And the third part of the creatures which were in the sea, and had life, died; and the third part of the ships were destroyed.
10
And 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;