Heating salt water causes the water to evaporate while the salt remains.
When water evaporates, salts in the water remain and become more concentrated.
When the water evaporates, a higher concentration of salts are left.
What increases in concentration when water evaporates?

A) nektar
B) sugar
C) sweat
D) salt
E) potash
F) Gases
G) maples
H) energy