AMPLIFIED is a world type released in the 1.7.2 update. It greatly increases the proportions of world features, especially mountains and ravines. In addition, world generation is more likely to be skewed or otherwise unnatural. AMPLIFIED worlds are often difficult for computers to load, resulting in a sharply decreased FPS and possible crashes or memory losses.
Most biomes are affected by AMPLIFIED world generation; some are not. These unaffected biomes are:
All other known biomes are affected by AMPLIFIED world generation. "M," or mountainous, varieties of biomes are often much more affected than others. Extreme Hills, Mesas and Extreme Hills+ biomes, due to their already hilly nature, are affected greatly. All biomes with descents to a River at the edge will be affected to some degree.