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Rhyolite By: Reid, Colten, Ashley, and Becca
Observations Black  Rough Crystals Inside Clay colors Has  a point on end of rock.
How Rocks Are Formed? Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapp...
Metamorphic Metamorphic Rocks are formed when existing igneous or sedimentary rocks are changed by pressure and heat, but ...
SEDIMENTARY For millions of years our earth has been eroding and broken away by wind and water then the earth’s pieces go ...
Conclusion We think that are rock is a  metamorphic  rock because the rock has grains, dark colored, and has layers.
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Rhyolite Final Presentation

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Rhyolite Final Presentation

  1. 1. Rhyolite By: Reid, Colten, Ashley, and Becca
  2. 2. Observations Black Rough Crystals Inside Clay colors Has a point on end of rock.
  3. 3. How Rocks Are Formed? Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. Igneous rocks are also formed when volcanoes erupt. Lava shoots out when it erupts and then it cools into Igneous rocks. Characteristics The presence of vesicles (Holes) in extrusive Igneous rock may dark-colored and heavy. Common Rocks of This Type: Granite, Basalt, Obsidian, Pumice, and Scoria Picture from Rock Hounds Picture from Rock Hounds By: Reid Scoria Rock Obsidian Rock Igneous
  4. 4. Metamorphic Metamorphic Rocks are formed when existing igneous or sedimentary rocks are changed by pressure and heat, but without melting. This can happen by contact with cooling Igneous rocks or at the edges of tectonic plates where very high temperatures and high pressures occur as mountains are being formed. Layering, banded light + dark colors, texture of large grains “ching” the sound of “chunk” when tapped. How is This Rock Formed? Characteristics Common Rocks Of This Type By:Ashley Quartz, Amethyst, Marble, Slate, Gneiss, Graphite, Coal, and Schist Schist Gneiss Quartz Amethyst Marble Slate Gneiss Graphite Coal
  5. 5. SEDIMENTARY For millions of years our earth has been eroding and broken away by wind and water then the earth’s pieces go down streams ,at the bottom of rivers, lakes, and oceans. Layer after layer of eroded earth is pressed on top of each other they get pressed more and more until finally this turns to rock. How is this rock formed? Sedimentary rocks have a layered appearance. Some contain fossils of plants and animals that got trapped why the rock formed. Also they are light colored and light weighted. Characteristics Limestone, sandstone, mudstone, shale, conglomerate, gypsum, and jasper. Common Rocks of This Type By: Colten & Becca
  6. 6. Conclusion We think that are rock is a metamorphic rock because the rock has grains, dark colored, and has layers.

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