The six seals in Revelation 6 are opened one by one. The first seal reveals a rider on a white horse who goes out to conquer. The second seal involves a rider on a red horse who takes peace from the earth. The third seal shows a rider on a black horse who carries scales, implying famine. The fourth seal discloses a pale horse whose rider is Death, and they are granted power to kill by sword, famine, plague, and wild beasts. The fifth seal depicts the souls of martyrs crying out to God for vengeance. The sixth seal involves cosmic disturbances like earthquakes and the sun and moon becoming dark.