They are found in Revelation 6:1-17 and Revelation 8:1-5. As each of the seven seals is broken, a picture or representation of events that took place on the earth during that seal period is described.

Revelation 8 reads: "When he opened the seventh seal, there was silence in heaven for about half an hour. ... "And I saw the seven angels who stand before God, and seven trumpets were given to them.