Revelation 16:3
And the second angel poured out his bowl upon the sea; and it became blood, like the blood of a corpse, and every living creature died??verything in the sea.
Revelation 8:8-9
And the second angel blew his trumpet, and something like a great mountain burning with fire was hurled into the sea; and a third part of the sea became blood;
Revelation 11:6
These have power to shut heaven so that it does not rain in the days of their prophecy; and have power over waters to turn them to blood, and to smite the earth with all plagues, as often as they will.
Revelation 10:2
In his hand he had a little book, open; and he set his right foot upon the sea, and his left upon the land.
Revelation 13:1
Then I saw rising up out of the sea a beast who had ten horns and seven heads. On his horns he had ten diadems, and on his heads blasphemous titles.