Hi Billy
Preceeding the sealing
Revelation 7 Authorized (King James) Version (AKJV)
1 And after these things I saw four angels standing on the four corners of the earth, holding the four winds of the earth, that the wind should not blow on the earth, nor on the sea, nor on any tree. 2 And I saw another angel ascending from the east, having the seal of the living God: and he cried with a loud voice to the four angels, to whom it was given to hurt the earth and the sea, 3 saying, Hurt not the earth, neither the sea, nor the trees, till we have sealed the servants of our God in their foreheads.
and then after the sealing
Revelation 8 Authorized (King James) Version (AKJV)
7 The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up.
8 And the second angel sounded, and as it were a great mountain burning with fire was cast into the sea: and the third part of the sea became blood; 9 and the third part of the creatures which were in the sea, and had life, died; and the third part of the ships were destroyed.
10 And the third angel sounded, and there fell a great star from heaven, burning as it were a lamp, and it fell upon the third part of the rivers, and upon the fountains of waters; 11 and the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.
12 And the fourth angel sounded, and the third part of the sun was smitten, and the third part of the moon, and the third part of the stars; so as the third part of them was darkened, and the day shone not for a third part of it, and the night likewise. 13 And I beheld, and heard an angel flying through the midst of heaven, saying with a loud voice, Woe, woe, woe, to the inhabiters of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!
and if you read on further it becomes evident that these are events that have not happened yet.
I hope this helps.
Hence that Dan isn't mentioned as one of the tribes with 12,000 sealed is very puzzling.
It is also interesting that ALL of the GREEN grass is burned up. Dry and brown grass you could easily understand ..... but green grass doesn't burn very well (i.e. not at all). This is also very puzzling to me. All I can think is that the poisoned water kills the grass, turns it brown and dead and when dry it burns.