Minecraft "doesn't like" to obey the laws of physics, and the law of mass preservation is no exception. The cobblestone generator in Minecraft will generate the cobblestones endlessly. These generators are useful when building materials are needed, as well as for survival on the SkyBlock map.
Step 1
Collect the items you need. You will need three iron bars to scabble the bucket, a lava source, and a water source. Take the iron underground or look for it on the walls of the cave. Melt the iron in the oven and then scrubbing the bucket. Lava is sometimes found on the surface, but to find it in excess, go underground below the coordinates Y:9.
Create two buckets if you want to carry lava and water at the same time.
The cobblestone (or another non-flammable block) can be used to reduce the likelihood that the cobblestones generated will fall into the lava.
If you play on the SkyBlock map, instead of a bucket of water you can take a piece of ice. To get water, break the ice.
Step 2
Dig a hole in one block deep, and dig another hole with two blocks deep next to it. Fill a hole with water one block deep so that water can flow into a hole two blocks deep.
If the water turns lava into obsidian, you probably haven't dug a second hole two blocks deep.
Step 3
Through one block from the water pit, dig a third hole in one block deep. Fill it with lava.
Step 4
Break the block between the pit with lava and the pit with water. In a second, a hissing sound will be heard and cobblestone will appear.
Step 5
Continue to break the cobblestone between the pits. The generator will produce an infinite amount of cobblestones.
Step 6
Improve the generator. Non-flammable blocks (cobblestone, mud, clay) close the pit with lava and pit with water, so as not to fall into them. It will also prevent damage to the cobblestones generated by lava. Break the block in front of the generator to come down and take the generated cobbles.