Revelation 8:6-7

 "And behold, I am coming quickly. 

Blessed is he who heeds the words of the prophecy of this book."     

Revelation 22:7  NASB

Then the seven angels who had the seven trumpets prepared to sound them. The first angel sounded his trumpet, and there came hail and fire mixed with blood, and it was hurled down on the earth. A third of the earth was burned up, a third of the trees were burned up, and all the green grass was burned up. 

Then the seven angels who had the seven trumpets prepared to sound them 
Revelation 8:2  And I saw the seven angels who stand before God, and seven trumpets were given to them.

The first angel sounded his trumpet, and there came hail and fire mixed with blood 
Ezekiel 38:22  " 'I will execute judgment on him (Gog) with plague and bloodshed; I will pour down torrents of rain, hailstones and burning sulfur on him and on his troops and on the many nations with him.' "
Exodus 9:18-19  " 'Therefore, at this time tomorrow I will send the worst hailstorm that has ever fallen on Egypt, from the day it was founded till now. Give an order now to bring your livestock and everything you have in the field to a place of shelter, because the hail will fall on every person and animal that has not been brought in and is still out in the field, and they will die.' "
Psalm 18:12  Out of the brightness of his presence clouds advanced, with hailstones and bolts of lightning.
Revelation 16:21  From the sky huge hailstones, each weighing about a hundred pounds, fell on people. And they cursed God on account of the plague of hail, because the plague was so terrible.

A third of the earth was burned up, a third of the trees were burned up, and all the green grass was burned up 
Revelation 9:3-6  And out of the smoke locusts came down on the earth and were given power like that of scorpions of the earth. They were told not to harm the grass of the earth or any plant or tree, but only those who did not have the seal of God on their foreheads. They were not allowed to kill them but only to torture them for five months. And the agony they suffered was like that of the sting of a scorpion when it strikes. During those days people will seek death but will not find it; they will long to die, but death will elude them.
Revelation 9:17-18  The horses and riders I saw in my vision looked like this: Their breastplates were fiery red, dark blue, and yellow as sulfur. The heads of the horses resembled the heads of lions, and out of their mouths came fire, smoke and sulfur. A third of mankind was killed by the three plagues of fire, smoke and sulfur that came out of their mouths.

(parentheses are mine)

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
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