Revelation 16:3
Then the second angel emptied his bowl upon the sea; and it turned to blood like the blood of a corpse, and every living thing died--everything in the sea.
Revelation 8:8-9
Then the second angel blew; and what appeared to be a great mountain, burning, was hurled into the sea. A third of the sea became blood,
Revelation 11:6
These men have the power to close the heavens, that 'no rain may fall' during the time that they are teaching; and they have power 'to turn the streams into blood, and to smite the land with any Curse,' whenever they will.
Revelation 10:2
in his hand he held a little book open. He set his right foot on the sea, and his left on the land;
Revelation 13:1
Then I saw, 'rising out of the sea, a wild Beast with ten horns' and seven heads. On its horns were ten diadems, and on its heads were blasphemous names.