The signs of the Apocalypse, according to the book of Revelations in the Bible, include earthquakes, deadly plagues, famine, the ocean turning to blood and the sky turning dark. In the Christian Bible, there are seven seals, seven trumpets and seven bowls that represent the worsening events before the final apocalyptic battle.
The seven seals in Revelations are the first group of judgments leading up to the Apocalypse. The first four seals are described as horsemen and are also known as the Four Horsemen of the Apocalypse. The first horse is thought to be the Antichrist, the second is the horseman of war, the third is the horseman of famine and the fourth is plague.
The fifth seal describes Christians martyred for their faith, while the sixth describes a huge earthquake, followed by a black sun, blood moon and stars falling from the sky. The seventh seal reveals the seven trumpets, and those cause plant life, sea life and lakes and rivers to die. They also cause an army of demonic locusts, a demon army that kills a third of all the people left on the Earth, and the sun and moon to be darkened. The final trumpet reveals the seven bowl judgments.
The bowl judgments include the rivers turning to blood, all sea life dying, painful sores, the sun growing much hotter and another huge earthquake followed by huge hailstones.