Summary: The first trumpet affects a third of the earth in some way.
Summary: Something like a burning mountain was "thrown into" the sea causing 1/3 of the ocean/sea to become blood.
Summary: A great star called Wormwood falls on 1/3 of the rivers and on the springs of waters. Many men died from the "bitter waters".
Summary: A third of the sun, a third of the moon, and a third of the stars were "smitten". What was the result?
Summary: The locusts from the bottomless pit who only had power to hurt men/people who do not have the seal of God on their foreheads. The angel of the abyss was their king.
Summary: This happens on earth at the Euphrates River. Four angels are released to kill a third of mankind.
Summary: Before the seventh trumpet is sounded, John is asked to eat a little book/scroll.
Summary: John is given a measuring rod and told to measure the temple of God and the altar and those who worship in it.
Two witnesses are granted authority to control people who desire to harm them, to shut up the sky, and to smite the earth with every plague, as often as they desire.
In the end the beast comes out of the abyss makes war with the two witnesses, overcomes them, and kills them. As you can imagine, this isn't the end of the story.