* Composition: Different basalts have different chemical compositions, with varying amounts of silica, iron, magnesium, and other elements. This variation affects the melting point.
* Pressure: As pressure increases, the melting point of basalt also increases. This is why basalt melts at a deeper depth in the Earth's mantle.
* Presence of water: Water lowers the melting point of basalt. This is why basaltic volcanoes often erupt explosively, as the water dissolved in the magma vaporizes and expands, creating pressure.
Generally, basalt melts at temperatures between 1000°C (1832°F) and 1200°C (2192°F) under atmospheric pressure.
However, in the Earth's mantle, where basalt originates, the pressure is much higher, leading to melting temperatures exceeding 1200°C.
