Revelation 8:8
And the second angel sounded; and the appearance of a great mountain burning with fire was cast into the sea; and a third part of the sea became blood,
Mark 11:23
I tell you truly, that whoever shall say to this mountain, be raised up and be cast into the sea, and shall not doubt in his heart, but shall believe that what he says will be done, whatever he says shall be done for him.
Revelation 8:7
And the first sounded; and there was hail and fire mingled with blood, and it was cast on the earth; and a third part of the earth was consumed, and a third part of the trees were consumed, and all the green grass was consumed.
Revelation 11:6
These have power to shut heaven, that it may not rain in the days of their prophecy, and they have power over the waters to turn them into blood and to smite the earth with every plague as often as they will.
Revelation 16:3-21
And the second poured out his bowl on the sea; and it became as the blood of a dead body, and every living soul died, the [creatures] in the sea.