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; 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.
(Revelation 8:8-9) KJV
And the second angel poured out his vial upon the sea; and it became as the blood of a dead man: and every living soul died in the sea.
(Revelation 16:3) KJV
The 1st trumpet/vial caused hail to fall on the land. That’s because the land, as we see it today, is distributed around the globe in a haphazard pattern. How could stellar material falling in an apparently random manner, and including a great mountain burning with fire, fall only on the sea? Consider this:
The earth and all the inhabitants thereof are dissolved: I bear up the pillars of it. Selah.
(Psalms 75:3) KJV
If geological features like Pilot Mountain, North Carolina are remnants of “the pillars of the earth,” it means that the mantle was once above the top of them and we can calculate the Earth’s original radius.
And unto Eber were born two sons: the name of one was Peleg; for in his days was the earth divided; and his brother’s name was Joktan.
( Genesis 10:25 ) KJV
The expansion of hell consumed the foundations of the mountains. That’s a way of saying that earth’s core became completely molten. The pillars of the earth lost their base of support. The mantle collapsed.