sand is solid so melting point and not boiling point
maybe you got confused with sand boils, it a phenomenon not a thing. It happens during ground cyclic events such as earthquakes that expels air from sand particles due to rearrangement of particles during the event making the sand to look like boiling
A sand boil occurs when the weight from the high river water pushes down (pressure) on the soil layers under the levee. If the water can find a weak spot in the soil, it will seep up to the surface on the land side of the levee. Sometimes it can look like it is bubbling or "boiling" and that is where it gets its name.
sand is solid so melting point and not boiling point
maybe you got confused with sand boils, it a phenomenon not a thing. It happens during ground cyclic events such as earthquakes that expels air from sand particles due to rearrangement of particles during the event making the sand to look like boiling