If a tree fals in the forest, and there's nobody around to hear it, does it make a sound?
These natural disasters are only disasters because people are around to witness (and suffer from) them.
From the Silmarillion:
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And Iluvatar spoke to Ulmo, and said, "Seest thou not how here in this little realm in the Deeps of Time Melkor hath made war upon thy province? He hath thought him of bitter cold immoderate, and yet hath not destroyed the beauty of thy fountains, nor of thy clear pools. Behold the snow, and the cunning work of frost! Melkor hath devised heats and fire without restraint, and hath not dried up thy desire nor utterly quelled the music of the sea. Behold rather the height and glory of the clouds, and the everchanging mists; and listen to the fall of rain upon the Earth!
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Quote:
And they built lands, and Melkor destroyed them; valleys they delved, and Melkor raised them up; mountains they carved, and Melkor threw them down; seas they hollowed, and Melkor spilled them, and naught might have peace or lasting growth, for as surely as the Valar began a labor so would Melkor undo it or corrupt it.
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A pretty violent, ongoing process, and yet:
Quote:
For the Children of Iluvatar were conceived by him alone; and they came with the third theme, and were not in the theme which Iluvatar propounded at the beginning, and none of the Ainur had part in their making.
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Natural disasters are only disasters from a human (or elvish) perspective. They have nothing to do with the (ongoing) shaping of Arda, marred or unmarred. We simply find them in our way!