Rocks PDF

  A. Sedimentary - Formed by the compaction and cementation of Rocks sediments – a process called LITHIFICATION B. Metamorphic Rocks C. Igneous Rocks - D. Rocks - E. Rock Cycle - At the end of lesson, the students sho...

  A. Sedimentary - Formed by the compaction and cementation of Rocks sediments – a process called LITHIFICATION B. Metamorphic Rocks C. Igneous Rocks - D. Rocks - E. Rock Cycle - At the end of lesson, the students should be able to: It is the science that deals with the study of the formation, composition, and classification of rocks Three Categories of Rocks Igneous Metamorphic Sedimentary Igneous Rocks A molten rock material below the Earth’s surface  LAVA A molten rock material at the surface of the Earth Igneous Rocks  TWO TYPES OF IGNEOUS ROCKS Extrusive Igneous Rocks Intrusive Igneous Rocks Igneous rocks are classified based on composition Igneous rocks are classified based on composition   generally very dark colored Classified based on texture fine grained (Fast cooling) Classified based on texture coarse grained (Slow cooling) Classified based on texture large crystals are set in a finer-grained (Two phases of cooling: one very slow, one fast)  Porphyritic basalt with phenocrysts of plagioclase (white)  Porphyritic rhyodacite with phenocrysts of light colored  Porphyritic phonolite with large phenocrysts of anorthoclase (pale colors)  Plagioclase glomerocrysts in andesite  Porphyritic granite with prismatic phenocrysts of alkali feldspar Classified based on texture If a rock looks like a block of (colored) glass, with no visible mineral crystals, Classified based on texture fragments ejected during explosive eruptions Classified based on texture fragments ejected during explosive eruptions  Pyroclasts and pyroclastic rocks may be seen in most parks that contain volcanoes or volcanic rocks