Lava (which as you undoubtedly know, is partially molten rock erupted by volcanoes) typically comes from the mantle—the Earth's middle layer, sandwiched between the crust and the core. Once it reaches the surface, lava quickly cools down and solidifies completely, creating new land.

Where is the best place to find lava?

Today, lava spawns naturally in Minecraft in a whole bunch of places. The easiest location to find it is in the nether, where it forms vast seas below y-level 31. But it'll also spawn in the overworld, replacing air blocks in caves at the bottom of the world.

What creates lava?

Lava is mostly made of two elements — Si (the symbol for silicon) and O (the symbol for oxygen). Together, they make a very strong bond and then get together with other elements, like Fe (iron), Mg (magnesium), K (potassium), Ca (calcium), and more. ... The volcano erupted it before the elements could become crystals.