you need to be more spacific what do you mean the first part the end sub mit your answer when your more spacific.
the hourglass itself
At the end of the ocean king's temple.
there is not an earth king but there is an ocean king
You have to go to the ocean temple and get the next sea chart.
there are no floors in the ocean realm.i think your confusing the ocean realm with the ocean temple.
The Tri-Force
Simple! You just need to get to the bottom of the temple of the ocean king
no clue but i think you have to use bomb
I think u have 2 have a hammer
In the temple of the ocean king like all the other ones.
You go to mercay island and go to temple of the ocean king
get to the safe zone at the bottom of the screen and draw an hourglass symbol on the door