Here's why:

* Crushed salt has a larger surface area than crystal salt. When you crush salt, you're breaking it into smaller pieces, exposing more of the salt to the solvent (water).

* Dissolving is a surface phenomenon. For salt to dissolve, water molecules need to come into contact with the surface of the salt crystals.

* The larger the surface area, the faster the dissolving. More contact points with water mean more salt molecules can interact with water molecules and dissolve at a faster rate.

By comparing the dissolving rates of crushed salt and crystal salt, you will observe that the crushed salt dissolves faster due to its increased surface area.