Rocks Rock!. Jan McClain Lydene Aldrich Virginia Acey. Agenda. Types of Rocks Igneous Sedimentary Metamorphic. Igneous Rocks. “Fire Rock” Intrusive Extrusive. Igneous Rocks. Granite – Intrusive rock formed slowly from pockets of magma that are trapped underground.
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Rocks Rock! Jan McClain Lydene Aldrich Virginia Acey
Agenda Types of Rocks Igneous Sedimentary Metamorphic
Igneous Rocks “Fire Rock” Intrusive Extrusive
Igneous Rocks • Granite – Intrusive rock formed slowly from pockets of magma that are trapped underground. • Pumice – Extrusive formed when lava cools quickly above ground. It is characterized by little pockets of air holes. • Scoria – Extrusive formed when lava cools quickly above ground. A kind of glass and not a mixture of minerals. • Obsidian – Extrusive formed when lava cools quickly above ground. It is actually glass and not a mineral and the edges of the rock are very sharp.
Sedimentary Rocks “Rocks formed by erosion and pressure.”
Sedimentary Rocks • Plant and animal matter settle in the sediment. • Pressure from the weight of the sediment creates layers of solid rock. • The rock layers are unique to sedimentary rocks. • Only rock that contains fossils. • Types: sandstone, limestone, gypsum, conglomerate, and shale.
Metamorphic Rocks “Rocks altered by heat or by heat and pressure.”
Metamorphic Rocks • Metamorphic rocks are sedimentary or igneous rocks that have been modified or changed in form. • Metamorphic rocks are identified by the types of minerals they contain and their texture. • These rocks make a "ching" sound instead of a "chunk" sound when tapped. • They are characterized by ribbonlike layers and may have shiny crystals. • Examples of this rock type include gneiss and marble.
Melting Metamorphic Rock Heat & Pressure Sedimentary Rock Magma Compacting &Cementing Cooling Weathering & Erosion Sediment Igneous Rock Rock Cycle
What geologic features do we see locally as the result of the Rock Cycle? • Erosion evidence • Sedimentary rocks • Rivers • Hills
What geologic features do we NOT see as the result of the Rock Cycle? • Volcanoes • Glacier Deposits • Deserts