When molten rock undergoes crystallization above ground, what type of rock results?

In 2002, the rare earth elements mine in mountain pass, california was closed because

Which substance has non polar covalent bonds

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.