Asilica tetrahedron is f: a. one silicon atom and three oxygen atoms b. one silicon atom and four oxygen atoms c. one silicon atom and three hydroxide molecules d. one silicon atom: three oxygen atoms: and more cations, depending on their charge the clay minerals fall into which of the silicate mineral groups? a. framework b. sheet c. single chain d. double chain one zone within the earth plastically and may even be partially molten. this is the: a. outer core b. inner core c. asthenosphere d. lithosphere one minerals of iron include: a. hematite b. magnetite c. pyrite d. all of the above portland cement uses what rock as its basic raw material? a. rock phosphate b. sandstone c. gypsum d. limestone the most important component of metamorphic processes is: a. heat b. pressure c. aqueous solutions d. depth foliation can be described as: a. parallel alignment of mineral grains b. parallel orientation of shear zones c. density segregation of minerals into parallel bands d. concentration of similar minerals in bands or layers by diffusion