Parallel drainage pattern. A parallel drainage system is a pattern of rivers caused by steep slopes with some relief. Because of the steep slopes, the streams are swift and straight, with very few tributaries, and all flow in the same direction.
1 In Creative, the player can use spawn eggs to spawn most mobs. 2  When mobs are spawned this way, all normal spawning requirements, such as light level and block type, are ignored. 3  Any entity can be spawned using the /summon command.
8 Answers 8. Edit: As of Minecraft 1.5 or so, Slime spawning has changed yet again. Right now, Slimes will only spawn in certain chunks of your map, depending on the map's seed. There are tools online such as this one that let you input your seed, and it will output the chunks of your map that will spawn Slimes.