Is our earth flat or round?

[Merlin]

Originally Posted by Dean Plejaren

The basic thing behind it being hollow is this.....

The lava exists heated by something, what heats it? An inside sun. A sun can't exist with an iron core or without space inside from the crust. How could lava stay hot forever without a heat source inside....

The heat source is compression. The Earth is not hollow, nor flat.