These crystals will grow and interlock to form a hard crystalline rock ... and from the skeletons of sea creatures. Metamorphic rocks close metamorphic rockMetamorphic rocks are those rocks ...

crystal structures, and the processes of crystallization. The film explains the differences between volcanic rocks, plutonic rocks, and metamorphic rocks, emphasizing the role of heat and pressure ...

Experts distinguish minerals based on their crystal structure ... There are three main types of rock — igneous, sedimentary and metamorphic — with varying mineral mixes depending on where ...