Falling Block

Falling blocks are an entity form of block which appears when gravity-affected blocks lose their support.

Spawning
Falling blocks spawn where gravity-affected blocks lose their base of support. These blocks include:

Behavior
Falling blocks will fall until they land on another block. If the block it lands on is solid, then the falling block will solidify back into its block state. If the falling block lands on a non-solid block it will break and drop as an item.