Minecraft wiki entry for Seed_(level_generation), associated text: Java Edition seeds between Alpha 1.2.0 and Beta 1.7.3 are mostly the same. Beta 1.8 changed world generation completely, and Release 1.2 changed locations of land biomes with the addition of jungles. Release 1.7.2 rewrote the world generation entirely, determining the arrangement of land biomes and oceans that are present until 1.17. 1.13 featured addition of underwater caves, new aquatic biomes, and adjustment to locations of mutated biomes and structures. 1.14 included the new bamboo jungle biome, and added snowy tundra villages and pillager outposts. In 1.16, shipwrecks and ocean ruins were made rarer, and four new biomes were added to the Nether. World generation is overhauled in 1.18, with the addition of bigger caves, biomes in caves, new mountains, changes in terrain height, and changed location of some structures. Not mentioned are structure additions in several updates throughout, but the addition of a generated structure usually does not require a complete change of biome generation.