Rocks rock
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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.

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Rocks Rock!

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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


The End


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