Can volcanic eruptions block out the sun?
Yes. When tremendous earthquakes occur, volcanic eruptions are likely. Volcanoes can spew so much dust and pollution into the atmosphere that the sun can almost be blocked out, appearing like a little red glow, and the moon can become as blood.
Les teaches that during the sixth seal, a great earthquake occurs, and the sun becomes black as sackcloth while the moon becomes as blood. He explains that tremendous earthquakes are more than likely accompanied by volcanic eruptions. From past observations, volcanoes can literally spew out so much dust into the atmosphere that the sun can almost be blocked out. Les clarifies it is not that God suddenly blackens the sun directly, but as a result of these planetary activities, the sun will become almost like a little red glow. The moon becomes as blood because of all the pollution blown into the atmosphere. This occurs as God deals primarily with Israel, in the time of Jacob's trouble, when the supernatural was commonplace.