Here's why:

* Sulfur exists in several forms: While sulfur is generally considered a solid at room temperature, it can exist in different forms (allotropes) with different melting points.

* Common form is rhombic sulfur: The most common form of sulfur at room temperature is rhombic sulfur, which melts at 115.21 °C (239.38 °F). This means it remains solid at temperatures below that.

Let me know if you have any other questions about sulfur!