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Obsidian is an igneous rock that forms from the rapid cooling of lava when it comes into contact with water or air, preventing the formation of crystals. As such, it forms outside the Earth, specifically at the surface or very near to it, after volcanic eruptions. This rapid cooling results in its glassy texture and appearance.
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What is obsidian's cleavage?
Obsidian does not have cleavage because of the way it forms. Obsidian is essentially nature's form of glass and so it has no regular or patterned crystal structure. Without that crystal structure, there is no cleavage.
When magma hardens inside the earths crust it can form vertical what and horizontal sills?
When magma hardens inside the Earth's crust, it can form vertical columns known as dikes, and horizontal layers called sills. Dikes form when magma cuts through pre-existing rock layers, while sills are formed when magma intrudes between existing rock layers.
Can igneous rocks form inside and outside of volcanoes?
yes
Do besalt rock former inside or outside or earth?
Basalt rock forms inside the Earth, typically as a result of volcanic activity. Magma from the mantle rises to the surface through volcanic eruptions and cools rapidly to form basalt.
What are extrusive rocks and intrusive rocks?
Extrusive rocks are formed outside of earths surface. Intrusive rocks are formed inside earths surface.
Would crystals would be more likely to be formed inside earth or outside earth?
Crystals are more likely formed inside the earth because the crystals length is dependent on the time it takes to cool. On the outside of the earth it is much cooler than the inside of the earth, so crystals don't have time to form after they have reached the surface.
How do obsidian rocks get from being minerals to a rock?
Obsidian rocks are formed from minerals underground in places like the earth's core and volcanoes. They require heat and pressure, which squishes the minerals together to form a rock. There is air trapped inside the rock when it is formed, which creates the bubbles, or "holes" inside the rock if you look at one. When I find out more about it, then I will let you know more about it.
Why would you not expect to find obsidian deep in the recesses of the earth?
Obsidian is another name for "volcanic glass". For a glass to form the molten lava must be cooled very, very quickly. The deep recesses of the Earth are not cold, they are warm and this means that molten lave intruded into the deep recesses of the Earth will not cool quickly and thus Obsidian can never form in these conditions. Obsidian can only form at the surface. However, there is one other way for a glass to be produced in Geology and that is by the heating generated by friction during a fault movement. This type of glass is called a "pseudotachylyte". These ARE generated in the deep recesses of the Earth.
Why is obsidian considered a granitic rock?
Obsidian is an extrusive igneous rock because it is formed from the rapid cooling of magma after eruption ontoEarth's surface. The rapid cooling of lava results in a fine-grained texture, or in this case (with obsidian), a glassy texture, where cooling takes place so rapidly that mineral crystals do not have time to form. Rock that is formed from slow cooling magma beneath the surface is intrusive igneous rock, and exhibits visible mineral crystals.Obsidian is an extrusive igneous rock.
What is obsidian's cleavage?
Obsidian does not have cleavage because of the way it forms. Obsidian is essentially nature's form of glass and so it has no regular or patterned crystal structure. Without that crystal structure, there is no cleavage.
How does granite form into Obsidian?
Granite does not directly transform into obsidian. Obsidian is formed when lava cools very quickly, without giving crystals a chance to form. Granite, on the other hand, forms deep beneath the Earth's surface through the slow cooling and solidification of magma. So, while both are igneous rocks, they form under different conditions.
How can you tell obsidian is an igneous rock?
Obsidian is a form of glass. Glass can only form when material cools from a molten state.
When magma hardens inside the earths crust it can form vertical what and horizontal sills?
When magma hardens inside the Earth's crust, it can form vertical columns known as dikes, and horizontal layers called sills. Dikes form when magma cuts through pre-existing rock layers, while sills are formed when magma intrudes between existing rock layers.
Can igneous rocks form inside and outside of volcanoes?
yes
High temperatures inside earth form.?
no can do
Do besalt rock former inside or outside or earth?
Basalt rock forms inside the Earth, typically as a result of volcanic activity. Magma from the mantle rises to the surface through volcanic eruptions and cools rapidly to form basalt.
Obsidian is a glassy form of?
Extruded lava.
