mediumwhat am-i
Lighter than what I am made of, More of me is hidden Than is seen.
Common Wrong Answers
“Snow”
Snow is not typically described as being 'lighter' than itself, and unlike an iceberg, it doesn't primarily exist in a submerged state.
“Cloud”
Clouds are not made of a solid material and do not have a significant portion hidden beneath a surface, unlike icebergs.
“Fog”
Fog is composed of tiny water droplets and does not have a hidden structure or mass; it also doesn't fit the riddle's context of being made of something solid.