in the periodic table, a set of properties repeats from row to row
This rock is balanced by roots on the ground that are very strong
I would be inclined to go with A, C and D
I believe it means that it takes a lot of heat in joules to make silicon vaporize so it stays solid until a great deal of heat has been added. By comparison, water has a latent heat of about 2260 joules per gram so vaporizes much more readily than silicon.
