When the Lamb broke open the seventh seal, there was silence in heaven for about half an hour.
Then I saw the seven angels who stand before God, and they were given seven trumpets.
Another angel, who had a gold incense container, came and stood at the altar. He was given a lot of incense to add to the prayers of all God's people and to offer it on the gold altar that stands before the throne. 1
References for Revelation 8:3
8.3 a Am 9.1; b Ex 30.1, 3.
The smoke of the burning incense went up with the prayers of God's people from the hands of the angel standing before God.
Then the angel took the incense container, filled it with fire from the altar, and threw it on the earth. There were rumblings and peals of thunder, flashes of lightning, and an earthquake. 2
References for Revelation 8:5
8.5 a Lv 16.12; Ez 10.2; b Ex 19.16; Rev 11.19; 16.18.
Then the seven angels with the seven trumpets prepared to blow them. 3
References for Revelation 8:6
+28.6, 7 Ws 11.5--12.2.