Why does diamond have a higher melting point than silicon?

The bond energy of Si is generally considered to be lower than that of the C-C, so a simple explanation is that diamond has a stronger bond. It has a high melting point and boiling point as much energy is needed to break the many strong covalent bonds.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.