Major types of rocks include a. sedimentary rocks. b. metamorphic rocks. c. igneous rocks. d all of the above 2. Which rocks may form on Earth's surface? a. sedimentary rocks b. metamorphic rocks c. igneous rocks d. two of the above 3. Weathering and erosion occur because of the actions of a. ice. b. wind C. water. d. all of the above 4. The process in which sedimentary rocks form begins with a. erosion. b. deposition. c. weathering. d. compaction. 5. The rock called limestone forms when shells of sea organisms settle to the bottom of the water and gradually become pressed and cemented together. Which type of rock is limestone? a. igneous b. metamorphic c. sedimentary d. none of the above 6. If limestone is buried under the ground and placed under pressure until it becomes extremely hot, it changes to marble. The process in which marble forms from limestone is a. melting. b. compression c. sedimentation

已完成理解「Major types of rocks include a. sedimentary rocks. b. metamorphic rocks. c. igneous rocks. d all of the above 2. Which rocks may form on Earth's surface? a. sedimentary rocks b. metamorphic rocks c. igneous rocks d. two of the above 3. Weathering and erosion occur because of the actions of a. ice. b. wind C. water. d. all of the above 4. The process in which sedimentary rocks form begins with a. erosion. b. deposition. c. weathering. d. compaction. 5. The rock called limestone forms when shells of sea organisms settle to the bottom of the water and gradually become pressed and cemented together. Which type of rock is limestone? a. igneous b. metamorphic c. sedimentary d. none of the above 6. If limestone is buried under the ground and placed under pressure until it becomes extremely hot, it changes to marble. The process in which marble forms from limestone is a. melting. b. compression c. sedimentation」