Gravel

Gravel
Gravel is a type of block typically found in naturally occurring pits, underwater, on beaches (more commonly in older versions of the game), NPC Villages as pathways, or in The Nether. It is generated at a rate of approximately 3.29% that of stone between layers 1 and 111.

Like Sand, Gravel is affected by gravity and will fall to the nearest solid block below it. Therefore it is possible to suffocate with careless use of gravel by being surrounded by it. If the lowest block in a column of Gravel is occupied by a partial block, such as a Torch, the Gravel block will drop and turn into a resource entity when it hits the partial block.

Gravel has a 10% chance of dropping flint once destroyed. Flint is used to create Flint and Steel and Arrows. Gravel blocks that don't drop flint can be picked up, placed, and destroyed again. However, if a gravel block drops flint, it does not additionally drop a gravel block, preventing the creation of an infinite amount of flint. Flint can be obtained from gravel with any tool. Flint can also be obtained by using TNT on gravel. Use of the fortune enchantment will improve the chances of flint.