How is evaporation different from boiling?
In evaporation, the solvent is allowed to disappear to obtain the solute, such as getting karkatch salt from sea water. The solvent is lost in this process.
On the other hand, boiling involves heating a liquid to vaporise it. For example, panga salt was obtained by boiling concentrated sea brines. Moreover, in distillation, boiling is used to vaporise a liquid so it can be cooled and recovered, which means the solvent does not disappear like it does in evaporation.
Explanation
The provided context does not give the standard theoretical differences between evaporation and boiling (like surface vs. bulk phenomenon). Instead, it describes their practical differences through the extraction of salt and the process of distillation. The answer is constructed strictly using these contextual facts: evaporation makes the solvent disappear (karkatch salt), whereas boiling is an active heating process (panga salt) that can be followed by condensation to recover the solvent (distillation).