What is the difference between a two dimensional form and a three dimensional one

Two-Dimensional form (2D) is only length x width, it has no depth, like paper.

Three-dimensional form (3D) is length x width x height, like a cube.

grunge  bands  such as nirvana, pearl jam, soundgarden, and alice in chains broke into the mainstream, achieving commercial chart success and widespread exposure. punk revival  bands  like green day and the offspring also became popular and were grouped under the "alternative" umbrella.