A student wants to remove the salt from a mixture of sand and salt in order to get only pure sand. He adds water to the mixture. Why is this step helpful? A Salt dissolves in water.
B Sand dissolves in water.
C The water freezes to the salt.
D The salt floats on top of the water.

Here is one way: Add water to the mixture. Only the sugar dissolves. This is a physical change.

Explanation:

The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separated.

A

Explanation:

the salt mixes with the water while the sand does not

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.