Falling Block

A falling block is an entity form of block that appears when a gravity-affected block loses its support.

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

Behavior
A falling block continues falling until it lands on another block. After landing, if the block in its place (the coordinates of the center at the bottom of its collision box) is replaceable (such as grass, water, vine, air, etc.) then the falling block returns to its block state. Otherwise, it breaks and drops as an item. Clever manipulation of this allows you to to convert falling blocks into other falling blocks using exploits and bugs, allowing you to get almost any block in item form, for example, bedrock, barrier blocks, end portal blocks, command blocks, water and lava tiles, etc.

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