Revelation 8:8

Overview - Revelation 8
At the opening of the seventh seal,
Seven angels have seven trumpets given them.
Four of them sound their trumpets and great plagues follow.
Another angel puts incense to the prayers of the saints on the golden altar.
Treasury of Scripture Knowledge

Revelation 8:8  (King James Version)
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;

and as
Jeremiah 51:25 ; Mark 11:23

Amos 7:4

the third
7 ; 16:3-21 Exodus 7:17-21 ; Ezekiel 14:9