1 / 15

Ch. 4- Rocks

Ch. 4- Rocks . Rock : solid mixture of crystals of 1 or more minerals. Characteristics to Classify Rocks . Composition : minerals that make up rock Texture : size, shape, and positions of the grains in rock 1. Fine grained 2. Medium grained 3. Coarse grained. Rock Cycle .

luz
Télécharger la présentation

Ch. 4- Rocks

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ch. 4- Rocks

  2. Rock: solid mixture of crystals of 1 or more minerals.

  3. Characteristics to Classify Rocks • Composition: minerals that make up rock • Texture: size, shape, and positions of the grains in rock • 1. Fine grained • 2. Medium grained • 3. Coarse grained

  4. Rock Cycle • Rock cycle is a continual process by which new rock form from old rock material.

  5. Processes that shape the surface of the earth: • Weathering • Erosion • Deposition • Uplift

  6. Sedimentary Rock • Form by process of erosion and weathering to break down other rocks into sediment which is deposited and compacted

  7. Sedimentary Rock • 3 types of sedimentary rock: • 1. Clastic Sedimentary rock- forms when rock or mineral fragments are cemented together • Classified by size of fragments they are made of • 2. Chemical Sedimentary rock: form from solutions of dissolved minerals and water • Crystallize out of solutions- EX- salt water

  8. 3. Organic- forms from remains of plants and animals that cement together • EX- limestone • Sedimentary structures include: • Ripple marks • Mud cracks • Raindrop impressions

  9. Metamorphic Rock • “meta”= change • “morphos”= shape • Structure, texture, or composition has changed. • Most common metamorphic change is caused by pressure

  10. Texture of Metamorphic Rock • Foliated metamorphic rocks- mineral crystals aligned in planes or bands • Non-foliated metamorphic rocks- not aligned crystals • Metamorphic structures are caused by deformation.

  11. 2 Types of Metamorphism • 1. Contact Metamorphism: when a rock comes on contact w/ magma or heat from magma. • Only occurs next to igneous intrusions • 2. Regional Metamorphism: enormous pressure b/w deeply buried rock or when crusts collide causing heat and the pressure to change rock.

  12. Igneous Rock • Igneous comes from the Latin word “fire” • Form when magma cools and hardens • Texture is determined by rate at which the rock cools

  13. Igneous rock that solidifies at Earth’s surface- extrusive • Igneous rock that solidifies within earth’s surface- intrusive

  14. Common shapes of intrusive igneous bodies: • Batholiths • Stocks • Sills • Dikes

  15. Classifying Igneous Rock: • 1. Felsic: • Light colored • Less dense • Rich in silicon, aluminum, sodium, potassium • 2. Mafic: • Dark colored • More dense • Rich in iron, magnesium, calcium

More Related