What is the most common silicate mineral in the crust of the Earth?
Feldspar is the most common mineral in the crust of the Earth. It is not common at the surface of the Earth because it is susceptible to conditions there which causes it to breakdown and weather into clay. 9. The temperature of the Earth increases with depth. Why then is the outer core molten and the inner core solid? The melting temperature of a substance is directly related to temperature and inversely related to pressure. The high pressure of the inner core raises the melting temperature of the inner core. Therefore, the inner core is not hot enough to melt.
