GIA Diamonds and Diamond Grading: Assignment 3 Questionnaire

How are igneous rocks formed? A. In gas B. By erosion C. From a molten state D. By heat and pressure - C. From a molten state How can crustal diamonds form? A. Oceanic subduction B. Volcanic eruptions C. Meteorite impacts D. Radiation decay - C. Meteorite impacts How does metasomatism affect lithospheric diamond formation? A. Supplies heat B. Transports rock C. Removes oxygen D. Provides hydrogen - C. Removes oxygen What are the rock types where most diamonds form? A. Basaltic crust B. Granite and graphite C. Peridotite and eclogite D. Kimberlite and lamproite - C. Peridotite and eclogite What best describes the lithosphere? A. Inner core B. Oceanic crust C. Transition zone D. Crust and uppermost mantle - D. Crust and uppermost mantle What causes the movement of the earth's plates? A. Volcanism B. Subduction C. Metasomatism D. Mantle convection - D. Mantle convection What does basaltic rock chang