Two? Wormwood and ___?
Wormwood is described and named in verse 10, but verses 7 & 8, the first and second angel, could also be meteor strikes. or a meteor that broke apart before it landed.
Revelation 8:6-10 Now the seven angels who had the seven trumpets prepared to blow them.
7 The first angel blew his trumpet, and there followed hail and fire, mixed with blood, and these were thrown upon the earth. And a third of the earth was burned up, and a third of the trees were burned up, and all green grass was burned up.
8 The second angel blew his trumpet, and something like a great mountain, burning with fire, was thrown into the sea, and a third of the sea became blood.
9 A third of the living creatures in the sea died, and a third of the ships were destroyed.
10 The third angel blew his trumpet, and a great star fell from heaven, blazing like a torch, and it fell on a third of the rivers and on the springs of water. 11 The name of the star is Wormwood. A third of the waters became wormwood, and many people died from the water, because it had been made bitter.
Revelation 9:1 And the fifth angel blew his trumpet, and I saw a star fallen from heaven to earth, and he was given the key to the shaft of the bottomless pit.
And possibly……
Revelation 18:21 Then a mighty angel took up a stone like a great millstone and threw it into the sea, saying, So will Babylon the great city be thrown down with violence, and will be found no more;………..