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Rocks geol 1


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Rocks geol 1

  1. 1. Types Of Rocks ROCKS
  2. 2. Metamorphism RockGneissic Gneissic rock come from the Metamorphism rock. Metamorphism rock change the form. The changes are in the mineralogy, texture, and sometimes the chimical composition of rocks Metamorphism rocks takes place usually in elevates temperatures and pressures. This rocks gradually changes until state of equilibrium with the new enviroment. The Agents of metamorphims include heat, pressure, and chemically active fluids.
  3. 3. Gneissic Gneissic rock is common and widely distributed type of rock. The rocks with a banded appearence are call gneissic. Foliated gneissic will not usually split as easily as slates and some schists. This gneissic rock I found in Turlock. The place was in my way to Turlock near to highway
  4. 4. Gneissic I identify the rock for the texture because are a little dark biotite flakes and the light silicate minerals. Given the rock a banded or layered appearance. Gneissic is a foliated texture
  5. 5. Quartz The Changes on Metamorphism rocks increased the density, change in size, reorientation of mineral grains The transformation of low temperature minerals into high temperature minerals. Metamorphism rocks can be broadly classified in foliation exhibited and to lesser extend on the chemical composition. Quartz is a very hard metamorphism rock.
  6. 6. Quartz The quartz is a non foliated texture Fused quarts grains, massive, very hard We can find this type of rock in the water or near to it. The quarts are formed in sandstone. Quartz formed under moderate to high grade and the grains in sandstone fuse together. The quartz ridges are often bare or covered only with very thin layer of soil and a little vegetation.
  7. 7. I identify this rock because is near to the water in yosemite and this rock shows grainstypical of a quarts and this rocks are white to gray.
  8. 8. Sedimentary Rocks About 75 percent of the land areas are covered by sediments and sedimentary rocks. Across the ocean floor the earth solid surface, virtually everything is covered by sediment. This rocks are mostly located in mid ocean, water and at some volcanic areas. The particles of the sedimentary rocks by accumulating is call sediment.
  9. 9. Sedimentary Rocks The sediment are formed by weathering and erosion in a source area and then they are transported to the place of deposition by water, winds mass movement or glaciers This group of rock provides geologists with much of the basic information they need to reconstruct the details of Earth history.
  10. 10. Sandstone The name of this rock in which the sand size grain dominate Sandstone is the most abundant sedimentary rock, accounting for approximately 20 percent of the entire group. Sandstone form in a variety of environment and often contain significant clues about their origin. The shapes of the sand can also help decipher the history of sandstone. The sandstone also containing significant amount of feldspar and angular grain of the ferromagnesian minerals.
  11. 11. This sandstone is a sedimentary rock and I found it in Turlock Lake in the cold water
  12. 12. Igneous The igneous rocks are composed or interlocking crystals. Igneous form in two basics setting Magma and Crystallizes. When magna loses its mobility before reaching the surface it eventually crystallizes form in a igneous rocks. They also known as plutonic rocks. Igneous rock are abundant in western portions of the american like vocanic peak cascades and mountains .
  13. 13. Granite Rock This rocks dominated in minerals. The geologist also refers to granite rock as being felsic. Granitic rocks are rich in silica about 70 percent.
  14. 14. The granite is an igneous rock I found this in Yosemite mountains I identify this rock forthe texture.
  15. 15. Mafic Basaltic Rock Basalt is a very dark green to black. This rock is composed primarily of pyroxene and calcium. Basalt is the most common extrusive igneous rock. Many volcanic island and iceland are composed mainly of Basalt rocks/ I find that this rocks is a Basaltic for the color and texture and for the upper layers.