Mantle a. molten materials 2. Oceanic crust 8. Moho 1. Core b. iron rich metal c. innermost the central region d. rigid zone e, comparatively thinner f. beneath the crust 5. Outer core 5. Inner core g. entire center 7. Igneous B. Petrology . Igneous h. Sandstone 10. Lava 11. Basalt i. fundamental rock j. molten materials k long period of time 1. study of formation m. dark in color 12. Granite 13. Sand 14. Gravel n. breccia 15. Sheels o. limestone​