You need a Diamond Pick to harvest obsidian blocks.
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The only way to receive obsidian when mining is using a diamond pickaxe.
A portal to the Nether requires ten Obsidian blocks (eco version) or fourteen Obsidian blocks for the full version.
No, you need a diamond pickaxe to successfully mine obsidian, and it takes 15 seconds. With anything else it take a minute, roughly. If you do not use a diamond pickaxe you will not be able to mine the obsidian.
Adventure maps are usually used in minecraft maps it allows you to not break certain blocks but you can use a certain item to break that block.
In survival you use a piston but in creative you just break it.