The Rock Cycle By asha hanson

You can view my sources for the images by clicking the small i button on the bottom right of each slide. Any other photos were taken from around Clinton Lake or at my house.

Sedimentary rocks: sedimentary rock are formed when extreme pressure is exerted on sediment. Then a process called cementation occurs (see slide 4 for elaboration). One example of a sedimentary rock is bituminous coal.
This is a perfect example of sedimentary rock because you can see all of the layers and the sediment on top of the layers.
Igneous rocks: Igneous rocks form when magma rises to the surface, then cools and hardens. The rocks sometimes crystallize (or form crystals) depending on the contents of the magma. Lava rocks and other crystallized rocks such as granite are great examples of igneous rocks.
Metamorphic rocks: When pressure and heat occur on an already formed rock, they chemically and physically change and almost melt the rocks. After the change, these rocks are then classified as metamorphic rocks. Marble is one of many types of metamorphic rock.
This is one of my rocks that I got from South Dakota on a ranch, and I thought it would be a good example for a metamorphic rock.
Sediment and cementation: Sediment is pieces of dirt, dust, and broken up rock. When sediment builds up, it's compacts and a process called cementation occurs. Cementation presses the sediment together to form layers until a sedimentary rock is created.
Here is a picture of broken up rocks and dirt aka sediment.
Cooling and crystallization: when magma and lava flow from a volcano or underground deposits, they eventually cool and form hard rock classified as igneous rocks. Sometimes, crystals are formed inside of theses rocks with a process called crystallization.
Erosion and weathering: Erosion and weathering occur over long periods of time and break away or smooth down surfaces like rock. Some causes for erosion and weathering are wind, water, plants, animals, and humans or man made things. This example of sedimentary rock in a canyon has been worn down and smoothed over by wind. Weathering is when rock is broken apart or smoothed down and erosion is when rock is moved and changes position.
As you can see from the rippling on the rock and the crack, these are results of wind and waves wearing away the rock aka erosion.
Here is another example of cracks from erosion.
These rocks have been smoothed down and this is an example of weathering.
Heat and pressure: Heat and pressure caused by gravity can deform rocks and change them into metamorphic rocks. Excessive heat can also melt igneous rocks back into magma or lava.
Uplifting is caused by new igneous rocks being formed from underground magma. These rocks then create pressure and push upwards to make the igneous rocks already formed above them rise to the surface.
This diagram shows how the rock cycle works. Rocks skip around and repeat steps so they don't follow just one pattern. This is a great resource because it is an interactive diagram and you can click on each step in the rock cycle for more information.
Reflection: The type of rocks I am most interested in is metamorphic/crystallized-Igneous rocks because I like how the crystals look and how there are so many different colors and shapes of crystals. I'm also interested in how crystals form. I think the steps in the rock cycle are not always the same, and occur over different amounts of time for different types of rocks. When doing a presentation like mine, I think it is important to have lots of pictures and examples to show the reader what all of these steps look like. One question I am left with is about how long does it take for each type of rock to be formed?
Sources: 1. Holt Science and Technology; Earth Science book pages 90, 95, and 96 .................................................................. 2. Interactive rock cycle diagram from: ............ 3. -Weathering vs Erosion


Created with images by - "rocks" • scott1346 - "hoo-doos... you-doo?" • James St. John - "Red Fox Agate (Chubut, Patagonia, Argentina) 2" • James St. John - "Charoitite (charoite-dominated potassic metasomatite) (Early Cretaceous, 115-120 Ma; mine in the headwaters of the Davan-Ditmara streams area, south of Olekminsk, Yakutia, Siberia, Russia)" • James St. John - "Jasper breccia" • mahinui - "lava flow emerges" • PatternPictures - "antelope canyon lower canyon" • - "Temperatura Máxima ~~//~~ Heat 30º" • justinbaeder - "Up" • Moyan_Brenn - "Reflections" • storebukkebruse - "Crystal"

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