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It depends where you stand. Mountains, seas and regular plains will all have different block levels. On your Minecraft map you will see x, y and z coordinates. Y is the number of blocks you are above the bottom of the earth. Y:12 is the 12th layer.
You can only find diamonds in the bottom 16 layers of the map. You can find which layer you're in by hitting F3 (or fn+F3 on a Mac); look for your "y" coordinate.
Yes - and the location is different in every map. It will generate between 640 - 1152 blocks (in both the x and z) and the numbers can be negative as well, for example, x: -1100 z: 800
no because that's a map and you need Minecraft to install it in your Mincraft
Adventure mode is a mode mainly mod for map developers who create adventure maps or RPGs. It prohibits the player from mining except on blocks the developer creates.