Then the second angel sounded his trumpet, and something like a great mountain burning with fire was thrown into the sea. A third of the sea turned to blood,

Exodus 7:17
This is what the LORD says: By this you will know that I am the LORD. Behold, with the staff in my hand I will strike the water of the Nile, and it will turn to blood.

Jeremiah 51:25
"Behold, I am against you, O destroying mountain, you who devastate the whole earth, declares the LORD. I will stretch out My hand against you; I will roll you over the cliffs and turn you into a charred mountain.

Zechariah 13:8
And in all the land, declares the LORD, two-thirds will be cut off and perish, but a third will be left in it.

Zechariah 13:9
This third I will bring through the fire; I will refine them like silver and test them like gold. They will call on My name, and I will answer them. I will say, 'They are My people,' and they will say, 'The LORD is our God.'"

Revelation 8:7
Then the first angel sounded his trumpet, and hail and fire mixed with blood were hurled down upon the earth. A third of the earth was burned up, along with a third of the trees and all the green grass.

Revelation 9:15
So the four angels who had been prepared for this hour and day and month and year were released to kill a third of mankind.

Revelation 9:18
A third of mankind was killed by the three plagues of fire, smoke, and sulfur that proceeded from their mouths.

Revelation 11:6
These witnesses have power to shut the sky so that no rain will fall during the days of their prophecy, and power to turn the waters into blood and to strike the earth with every kind of plague as often as they wish.

Revelation 12:4
His tail swept a third of the stars from the sky, tossing them to the earth. And the dragon stood before the woman who was about to give birth, ready to devour her child as soon as she gave birth.

Revelation 16:3
And the second angel poured out his bowl into the sea, and it turned to blood like that of the dead, and every living thing in the sea died.

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;