Answer:
What gets broken when you don't hold it?
Mountains will crumble and temples will fall, and no man can survive its endless call. What is it?
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
I am the yellow hem of the sea's blue skirt.
Not my sister nor my brother but still the child of my mother and father. Who am I?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.