Sand Blocks

Sand Blocks are special Environmental Blocks that, unlike other placeable Blocks, conform to gravity. They deal damage to any player or mob it falls on. It is needed for making Glass which is used later on to make bottles.

Location
Sand is usually found in very vast amounts: Usually found in the form of a Desert, large areas of underground sand can be found as well. Digging through sandy areas is tedious and potentially dangerous.

Harvest
Because of its mechanics, and the fact that it is usually found in mass, Sand is especially easy to harvest: Simply Picking the bottom block will cause entire sections of Sand Blocks to collapse, and the sand block above it will fall into the location you're already digging.

Usage
The Sand Block's easy harvestability make it a prime candidate for an easy Coin making technique.

Because of its unique gravity conforming mechanics, Sand Blocks can be used to create Traps, both against Monsters or Players: Sand Blocks can be placed over a Cobweb. When the cobweb is destroyed, it releases the Sand Blocks. This can have many useful and fun effects, like crushing traps, or pitfalls.

Sand is also useful in the creation of mining shafts. While digging downward is can be used to create walls in caverns without ever actually entering the cavern.