In the Book of Revelation, seven trumpets are sounded, one at a time, to cue apocalyptic events seen by John of Patmos (Revelation 1:9) in his vision (Revelation 1:1). The seven trumpets are sounded by seven angels and the events that follow are described in detail from Revelation Chapters 8 to 11. According to the angels sound these trumpets after the breaking of the seventh seal. These seals secured the apocalyptic document held in the right hand of Him who sits on the throne. The trumpets are referred to in Koine Greek as σάλπιγξ (sálpinx, salpinx); this was a straight, narrow bronze tube with a mouthpiece of bone and a bell; they do not resemble modern trumpets. The final three trumpets are sometimes called the "woe trumpets". After the Exodus, God had Moses make two silver trumpets, (Numbers 10:2), later called the chazozra. The traditional sacred horn of the ancient Hebrews was the shofar, made from a ram's horn. Upon the sound of the first trumpet, hail and fire mingled with blood is thrown to Earth, burning up a third of the trees on the planet, and all green grass. With the sounding of the second trumpet, something described as "a great mountain burning with fire" plunges into the sea and turns a third of the oceans to blood. Soon after, a third of all sea life and a third of all ships will be destroyed. Some speculate that the "great mountain" will be an asteroid cast from the heavens. With the sounding of the third trumpet, a great star called Wormwood falls to the Earth, poisoning a third of the planet's freshwater sources, such as rivers and springs. Many will die from the bitterness of its taste. Some have speculated that this could be a nuclear disaster based on the association of wormwood being similar to the name Chernobyl. Following the sounding of the fourth trumpet, a third of the light that shines from the Sun, moon, and stars becomes dark from the celestial bodies being "struck." This catastrophe causes complete darkness for a third of the day, even through night hours.