The maximum limit of the world is 40000 blocks from the center in any direction, making it 80000m (if a block is 1mx1mx1m) on each side. this makes it about 64000km2, making it larger than Neptune!
Sorry it's probaly not possible ):
It is not a seed, it is a world download. Look up dropper world download on google or minecraft forums
The bottom of the world is the void.
to play a map, open minecraft, then click singleplayer, choose the world, then click play selected world.
A LAN world means if someone is playing Minecraft using the same modem/router as you, they can come into your world and play with you.
Yes there is such thing as the Ether World in Minecraft.
An underwater world seed for Minecraft is used to open an underwater world to play the game in.
Sorry it's probaly not possible ):
Yes, Minecraft is global.
No
Place the world in your minecraft bin's saves folder.
It is not a seed, it is a world download. Look up dropper world download on google or minecraft forums
You create a world and go into the world in minecraft.
Any world on Peaceful........................
The bottom of the world is the void.
To do this you have to down date your minecraft version, there are many downgraders out there and then change to name of the file you have the world named to world 1
to play a map, open minecraft, then click singleplayer, choose the world, then click play selected world.