History of Rocks A background of rocks by Philip clinton

Sedimentary Rocks are one of the three main groups of rocks and it formed in 3 different ways. One of the more common ways they are formed is by subsequent cementation at the Earth's surface and bodies of water.

There are 3 types of Sedimentary Rocks as shown below which are Clastic Rocks, Chemical Rocks, and Organic Rocks

As seen here, this is one of the three types of Sedimentary Rocks which is Clastic rocks, which are formed when broken pieces of other rocks are squeezed together, and are grouped by size fragments.
Chemical Rocks, are another type of sedimentary rocks, which are rocks formed when minerals dissolve in a solution crystalize or when a lake evaporates due to the dry climate forming a large mineral deposit.
As shown above here, the last kind of sedimentary rock is an organic rock which are rocks that are formed where the remains of plants and animals are deposited in thick layers, made up of parts of living things or are made by living things.
Sedimentary rocks are usually located among the Earth's surface by rivers, oceans, or lakes.
As we can see, Sedimentary rocks usually come before metamorphic rocks on the rock cycle.
While Sedimentary Rock is a type of rock in the rock cycle, Metamorphic Rock is also a kind of rock in the rock cycle and their are 2 types of Metamorphic rocks which are Foliated and Non-Foliated.
As shown above here, Slate, is a type of flat layered dark gray or light red color Metamorphic Rock and is usually used for floor tiles or roofing.
Phyllite, is another type of foliated metamorphic rock but the layers are not completely flat but have a slightly undulating pattern and have a silky appearance due to the growth of tiny mica plates orientated parallel to the foliation.
Schist is another foliated metamorphic rock that has larger mica crystals which means they tend to distinctly sparkle. Mica schists also contain garnet crystals or staurolite crystals, which produce a bumpy service. Schists are also made of talc, kyanite, pyrophyllite, chlorite, or sillimanite.
The last type of foliated metamorphic rocks are Gneiss and is almost classified as a granite.
The type of metamorphic rock shown here is marble which is a metamorphosed limestone and usually changes color and texture.
Quartizite is a metamorphosed sandstone that is often difficult to distinguish from sandstone.
Serpentine is used for both a mineral and metamorphic rock that's formed by a light green to a dark green color.
The last type of metamorphic rock which is hornfels that's formed by contact metamorphism.
Metamorphic rocks are usually found in mountainous ranges along the Earth's surface.
Metamorphic rocks are usually found after Sedimentary rocks in the Rock Cycle.
The last type of rocks in the Rock Cycle are Igneous Rocks which are usually formed by the ground.
One of the two types of Igneous Rocks is a Volcanic Rock, which are formed by the eruption of lava.
The second of the two types of Igneous Rocks is Plutonic Rocks, which are formed and solidified below the ground in the earth's surface.
Igneous Rocks are usually found after a volcanic eruption in certain parts of the world that have volcanoes.
Igneous Rocks are found after magma is flowed through the earth's surface, creating Igneous Rocks on the Rock Cycle.
One way that Geologists classify rocks is by scratching it up against glass to classify the type of rock it is to see whether or not it scratches glass.
Another way Geologists classify rocks is by seeing the color, pattern, and texture of the rock to classify the characteristics the types of rock may have.
One last way Geologists find ways to classify rocks is by seeing the type of weather a place is having and see what rocks form.
As you can see, there are different types of rock found on the earth today and many ways that they are formed.

The End

Created By
Philip Clinton


Created with images by sridgway - "Sedimentary rocks everywhere" • James St. John - "Chalk ("Upper Chalk" Formation, Upper Cretaceous; White Cliffs of Dover, England, southern Britain)" • James St. John - "Oncolitic limestone (Gros Ventre Formation, Upper Cambrian; Beartooth Butte, Wyoming, USA) 1" • James St. John - "Lignite coal (Tertiary; western USA)" • James St. John - "Grindstone from an end-Pleistocene large pothole (Interstate State Park, Taylors Falls, Minnesota, USA) 7" • NASA Goddard Photo and Video - "Black Marble - Americas" • James St. John - "Gold-quartz hydrothermal vein (Shamrock Mine, Union Mining District, Nye County, Nevada, USA) 1" • James St. John - "Red slate" • James St. John - "Staurolite schist (Keivy Schist; Mt. Ploskaya, Kola Peninsula, Russia)" • James St. John - "Talc schist 2" • James St. John - "Shocked gneiss (Eocene, 39 Ma; Haughton Impact Structure, Devon Island, northern Canada) 3" • uroburos - "marble stone rock" • ARG_Flickr - "The Curious Cleft Of Breabag" • James St. John - "Stichtitic serpentinite (Dundas Ultramafic Complex, Cambrian; Stichtite Hill, western Tasmania)" • James St. John - "Gold-quartz-sulfide hydrothermal vein (Winnemucca District, northern Nevada, USA)" • MemoryCatcher - "mountain wilderness peak" • James St. John - "Cherry blossom stones (pinite) in hornfels (mid-Cretaceous, 98 Ma; Mikata, Honshu Island, southern Japan)" • kurtdeiner - "rock volcanic hand" • James St. John - "Syenite (Cuttingsville Complex, mid-Cretaceous, 97 Ma; southwest of Cuttingsville, southern Vermont, USA)" • skeeze - "volcano halema‘uma‘u lava lake sunset" • auntieNkansas - "frame" • James St. John - "Granodiorite (Giant Forest Granodiorite, mid-Cretaceous, 97-102 Ma; Moro Rock, Sequoia National Park, California, USA) 4" • ricardobc - "CLOUDS PETROLINA PE BRAZIL" • stebulus - "rocks"

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