Rocks - PowerPoint PPT Presentation

rocks n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Rocks PowerPoint Presentation
play fullscreen
1 / 57
Rocks
241 Views
Download Presentation
knut
Download Presentation

Rocks

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Rocks

  2. Marble

  3. Sandstone, Marble and Granite

  4. Granite

  5. Korean War Memorial is actually made from stainless steel….. But I really like it so I wanted to show it to you

  6. Red Granite

  7. I Will Be Able To… • Arrange and define 4 stages of sedimentary rock formation. • Describe the difference between intrusive and extrusive igneous rock. • Recognize the difference between foliated and unfoliated • List common uses for 3 different types of rocks • Apply the rock cycle • Distinguish between the 3 classifications of rocks • Illustrate how a rock becomes a metamorphic rock • Evaluate rocks to determine their classification and names

  8. Definition • Rocks are the hard part of the earth • Rocks are composed of one or more minerals • Rocks can be made up of organic matter

  9. How to Classify Rocks Color Mineral Composition Texture Grain size Grain shape Grain pattern

  10. Color • This is a quick easy to observe property that can point you in the right direction. • Helps identify mineral composition Granite

  11. Texture • Grain size • Grain pattern • Grain shape

  12. Grain Size Fine Grained Medium Grained Course Grained

  13. Grain Shape Rounded grain Angular grain

  14. Grain Pattern Banded Non Banded

  15. Three Classifications of Rocks • Igneous • Sedimentary • Metamorphic

  16. Igneous rocks Fire rocks

  17. Igneous • Igneous Rocks are formed form lava or magma.

  18. Extrusive • Rocks formed form lava. These are also called volcanic rocks. • Pumice • Basalt • Obsidian

  19. Intrusive • Formed from magma • Granite • Gabbaro • Diorite

  20. Cooling Rates • Fast cooling have shinny reflections. • Slow cooling have visible crystals

  21. Granite • Light-colored, coarse- grained, no pattern • Mostly quartz, feldspar, mica, and hornblende • Often used for buildings and monuments

  22. Basalt • Dark-colored, fine- grained, extrusive • Formed where lava erupted onto surface • Most widespread igneous rocks • Found locally in the Palisades along west shore of Hudson River, Connecticut River valley

  23. Gabbro • Dark-colored, coarse- grained intrusive • Similar composition to basalt—plagioclase feldspar with some pyroxene and olivine

  24. Obsidian • Natural volcanic glass • Forms when lava cools very quickly • Usually dark, but small pieces may be clear • Fractures along curved (conchoidal) surface • Used as spear and arrow points, knives

  25. Uses Buildings Countertops Soap Aggregate

  26. Sedimentary Rocks Packed Rocks

  27. Sedimentary • Formed from fragments of rocks and minerals that break up or dissolve into water.

  28. Formation Process • Erosion • Deposition • Compaction • Cementation

  29. Erosion • Wearing away of rocks by wind, water, or ice.

  30. Deposition • Sediment settling out of the wind or water that is carrying it.

  31. Compaction • Process of sediment settling together

  32. Cementation • Process of dissolved minerals crystallizing and gluing rock sediments together.

  33. Types • Clastic • Organic • Chemical

  34. Clastic • Sedimentary Rocks composed of sediment and rock fragments that have been deposited, compacted and cemented.

  35. Pink sandstone • Pink or reddish in color • Composed of quartz and feldspar minerals • Texture • Medium Grain Size • Angular or Rounded Grain • Well sorted, no banding • Slightly porous

  36. Conglomerate • Color • Tan to dark brown with nearly any color spots • Fragments of all types of rocks usually cemented by quartz, iron oxides, or calcite. • Texture • Very course • Rounded Grain • Non banded

  37. Breccia • Color • Light brown or tan with grey white or black spots • Composed of all types of rocks and cemented by salts • Texture • Very course • Angular • Non banded

  38. Organic • Made from the organic material that has been deposited, compacted and cemented

  39. Coal • Color • Black or dark grey • Texture • Medium-Fine grained • Angular or rounded • Non banded

  40. Organic/Fossil Sandstone • Color • Light colored, white to yellow or tan • Texture • Medium or fine grained • Angular fragments • Non banded • May have distinct fossils

  41. Diatomite • Color • Light brown or tan • Composed of silica from hard celled algae • Texture • Fine grained • Rounded or Angular • Non banded • Powdery

  42. Chemical • Rocks that are formed form minerals that were once dissolved in water usually left behind after evaporation.

  43. Rock Gypsum Alabaster Rock Salt

  44. Uses Building Stones Cement Fiberglass Fuel

  45. Metamorphic Rock Changed Rock

  46. Metamorphic • Formed by heat and pressure of other rocks deep in the earth

  47. Regional • Plates get pushed under and thus pressurized and heated • Plates get pushed up into mountains

  48. Contact • Lava veins shooting up near rock give off intense heat

  49. Foliated • These rocks have a banded texture. • Can layers of the same rock or of crystals