- Slides: 23
What is a rock’s favorite cereal? Coco pebbles! What’s a rock’s favorite golf course? Pebble Beach!
Look at the three different rocks at your table. Discuss with your table mates: What makes these 3 rocks different? Differences: color, size, shape, texture What do they have in common? Similarity: all are made of smaller pieces (grains)
Types of Rocks Igneous Rocks Melted & cooled together Metamorphic Rocks Sedimentary Rocks Cemented together Sq he ueez a tog ted ed & eth er
Sedimentary Rocks How are they are made? n n Wind and water break down the earth Bits of earth settle in lakes and rivers Layers are formed and build up Pressure and time turn the layers to rock
Sedimentary Rock clastic non-clastic broken pieces of rock chemical organic (a precipitate (remains of plants comes out of & animals) water solution) eg. Stalactites/stalagmites
Sedimentary Rocks Where do you think sedimentary rocks would be formed/found near? streams rivers oceans beaches deserts glaciers coral reefs
Types of Sedimentary Rocks Sandstone Limestone Gypsum Conglomerate Shale
Metamorphic Rocks How are they made? Meta means “change” so these are rocks that have changed. n They were once igneous, sedimentary, or other metamorphic rocks. n Pressure and heat cause the change. n
Metamorphic Rock foliated “leafy” flattened & layered minerals slate nonfoliated no banding quartzite These rocks are physically deformed and chemically changed due to temperature and pressure changes but the rock does not melt!
Where are metamorphic rocks likely formed/found near? In fault zones Mountain belts Mid-ocean ridges
Types of Metamorphic Rocks Schist Gneiss
Igneous Rocks What are They? Ignis is Latin for “fire”-igneous rocks are fire rocks n Formed underground by trapped, cooled magma n Formed above ground when volcanoes erupt and magma cools n
light colored eg. quartz dark colored eg. Iron & magnesium containing mafic felsic Igneous Rock intrusive (plutonic) extrusive (volcanic) large crystals & coarse texture Glassy/smooth & small crystals usually not even visible
Where are igneous rocks likely formed/found near? Mid-ocean ridges Subduction zones volcanoes
Types of Igneous Rocks Granite Scoria Pumice Obsidian
Idioms and Expressions to Ponder Heart of stone unaffectionate, unforgiving, cold Head full of rocks acted without thinking intelligently Stuck between a rock and a hard place in a situation where you have to make a decision that has no good options or solution
Every rock tells a story about: • how it formed • the environment where it has been • what it has experienced Each of these stories is an adventure. We need to learn how to read a rock like we read a book.
Roundness and Sorting Roundness – presence or absence of corners and sharp edges Particles get rounder as they are transported. Sorting - is a texture that indicates how long the sediments have been in the water system. Poorly sorted sediments show a wide range of grain sizes; well-sorted ones have similar sized grains. Sorting increases with transportation.
low energy High Energy
Rock Cycle Activity Check the drawer. See which table can put together the rock cycle diagram first!