Washington DC Standards
DC.6.7. Rock Cycle: Broad Concept: Rock materials are continuously recycled in the rock cycle. As a basis for understanding this concept, students:
6.7.1. Recognize minerals are naturally occurring crystalline solids with definite chemical compositions and identify common minerals using a key to their diagnostic properties.)
6.7.2. Examine and recognize most rocks are made of one or more minerals.
6.7.3. Describe how igneous rocks are formed when older rocks are melted and then recrystallized. Understand they may be cooled deep in the Earth or at or near the surface as part of volcanic systems.
6.7.4. Explain how metamorphic rocks are formed when older rocks are heated (short of melting) and/or subjected to increased pressure.
6.7.5. Describe how sedimentary rocks are formed when older rocks are subjected to weathering into sediments, and those sediments are eroded, transported, deposited, then compacted and cemented.
6.7.6. Observe and describe common igneous, metamorphic, and sedimentary rocks, including granite, obsidian, pumice (igneous), slate, schist, marble (metamorphic), sandstone, shale, and limestone (sedimentary).
DC.6.9. Earth and Life History: Broad Concept: Evidence from rocks allows us to understand the evolution of life on Earth. As the basis for understanding this concept, students:
6.9.1. Explain how the Earth's surface is built up and broken down by natural processes, including deposition of sediments, rock formation, erosion, and weathering.