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Today’s Agenda • • • • Do Now How to identify different types of rocks What type of rock am I? What is the rock cycle!?! Set up graphic organizer in your notes: set up with 9 rows below Description type Associated rock type Picture Other important info Rock Color: • What color is it on the outside? • Dull rocks: sedimentary • Metallic rocks: igneous, sometimes metamorphic Mineral Grain Usually used to help determine igneous rock type • Fine grained- really small grains – Rock cooled quickly (usually extrusive) • Coarse grained- very large grains – Rock cooled slowly (usually intrusive) Grain Size: Fine Grained Grain Size: Coarse Grained Decide: Is each rock intrusive or extrusive? 1 2 3 4 Foliation (metamorphic rocks) • Foliation: the layering of a metamorphic rock – Foliation occurs when metamorphic rocks form under shearing pressures (transform boundaries!) Non-foliated metamorphic rock Foliated metamorphic rock Foliated or non-foliated? Foliated or non-foliated? Bonus Rock Categories: • Glassy- metamorphic rocks that cooled REALLY fast (ex: obsidian) • Layered: sedimentary rocks with distinct layers, usually that are different colors. Each layer made from different minerals/sand Bonus Rock Categories • Conglomerate: Sedimentary rocks with different materials in rock (fossils, dirt, small rocks, sand, etc) instead of layered. Can you identify that rock!?!!?! • Use the rock identification chart • Use the information you collected about each rock • Figure out the rock type (limestone) and the rock group (sedimentary) Basic Rock Descriptions • • • • Color Grain size Texture (feel) of the rock Composition (minerals, fossils, conglomerate, etc.) • Appearance (glassy, has layers) • Foliated/Non-Foliated (if you think it’s a metamorphic rock) • If you’re pretty sure about the rock type (granite) or the rock group (igneous), write that it with a question mark! What rock group is this? Igneous, Sedimentary, or Metamorphic General properties: hard, shiny, large mineral crystals What rock group is this? Igneous, Sedimentary, or Metamorphic General Properties: Dull, composed of sandy layers of rock What rock group is this? Igneous, Sedimentary, or Metamorphic General properties: hard, shiny, layers What rock group is this? Igneous, Sedimentary, or Metamorphic General Properties: Dull, composed of smaller rocks and sand particles What rock group is this? Igneous, Sedimentary, or Metamorphic General Properties: Dull to shiny, composed of small bits of mud and visible pieces of plants What rock group is this? Igneous, Sedimentary, or Metamorphic General Properties: Dull colored, not very heavy, very small grains Build your own rock • Decide your rock’s color, shininess, feel (graininess? Hardness?), texture (layered?), and other distinctive properties. List all significant descriptors of the rock. • When finished, draw your rock! Warm up • What is a cycle? Can you think of anything that operates or works in one? The rock cycle Main idea: ANY TYPE ROCK CAN BECOME ANY OTHER TYPE OF ROCK HOW CAN THIS WORK? • Metamorphic and Sedimentary rocks can melt and cool to become IGNEOUS • Igneous and Metamorphic rocks can experience erosion and deposition to become Sedimentary • Igneous and Sedimentary rocks can experience heat and pressure and become Metamorphic The Rock Cycle Forces deep inside Earth and at the surface produce a slow cycle that builds, destroys, and changes the rocks in the crust. The rock cycle is a series of processes that occur on the Earth’s surface and in the crust and mantle that slowly change rocks from one kind to another. Any type of rock can form into another type of rock. Independent Practice • Read the 1 page article on the Rock Cycle and answer the attached questions • When finished, define any of the bold vocab words in your notebooks Homework • Find 3 rocks at home and sketch them (or pictures of rocks online and print them out) • Describe the major characteristics of them and guess what type of rock it must be (igneous, metamorphic, sedimentary). If you can tell what type of rock it might actually be, go ahead and guess!
