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Obsidian Rock Cycle Dylan Goldberg
Transcript of Obsidian Rock Cycle Dylan Goldberg
Obsidian can be weathered and eroded into sediments and become black sand. Sediments are naturally occurring and are bits and pieces of weathered and eroded rocks that are moved by wind, water, ice, and gravity.
Obsidian is put in the category of volcanic glass. If a rock is volcanic glass, that means once it reached the Earth's surface, it cooled too quickly and couldn't form any crystals. Also, it is an igneous rock. An igneous rock is formed when hot magma cools and hardens.
Magma that cools quickly forms extrusive igneous rocks such as obsidian. Extrusive rocks are rocks that are formed when magma cools at or near the Earth's surface. Magma reaching the surface flows from a volcano as lava.
The sand can be compacted and cemented into a sedimentary rock called sandstone. Sedimentary rocks are formed in layers and are mostly found on the exposed surface of the Earth. Since sandstone is made up of sediments of other rocks, it is a detrital sedimentary rock.
Sandstone can be affected by heat and pressure and turn into a metamorphic rock called quartzite. A metamorphic
rock is formed as a result of high temperatures and high pressure. Also they are formed by hot fluids chemically changing them. Since sandstone is made up of mostly quartz grains and they do not form layers, quartzite is a nonfoliated metamorphic rock.
How Obsidian forms
By Dylan Goldberg
Weathering and erosion
Compaction, Deposition and Cementation
Heat and Pressure