* Water lowers the melting point: Water acts as a flux, which means it lowers the melting point of a substance.

* Why this happens: Water molecules disrupt the strong bonds within the rock's crystal structure. This disruption makes it easier for the rock to melt at a lower temperature.

Example: Imagine you're trying to melt ice. It melts at 0 degrees Celsius. But if you add salt to the ice, it will melt at a lower temperature because the salt disrupts the ice's crystal structure.

Important Note: The presence of water doesn't magically make rocks melt at room temperature. The lowering of the melting point is still significant, but it takes a combination of pressure and temperature for rocks to melt, even with the presence of water.