You need to be in survival or hardcore. Just attack the material until it breaks and you pick up the material
With a shovel
Leather is harvested by killing cows.
Use wheat which you can harvest/steal from villages
no, you can destroy them, but it is only uncommon they will drop seeds
If you run water over a lava source block you will create obsidian. Mine it with a diamond pickaxe to harvest it.
The only way to acquire fire blocks in Minecraft 1.2.x is to use inventory editors.
You cannot harvest plants in creative mode because you have all the resources in your creative inventory! So when you harvest a plant, it just breaks.
minecraft
Put a pumpkin in the crafting table or self crafting
Minicraft is a game similar to Minecraft, in which the player must harvest materials from a generated game world. The overall goal of the game is to kill an entity called "the Air Wizard," and many have compared it to old Zelda games.
The efficiency of a pickaxe in minecraft is the speed at which the pickaxe can mine materials.
There are TONS of items and materials on minecraft! It is too much to type it all. There is bedrock, diamond, redstone, coal, wood, glass ect;