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How is obsidian glass made?
Obsidian, or "volcanic glass," is made when molten rock comes out of a volcano and cools so quickly that no crystalline structure has time to form. This makes obsidian an extrusive igneous rock. The cooling occurs right at the surface.
How is obsidian and coal rock alike?
Obsidian and coal are both types of rocks formed through natural processes. However, obsidian is an igneous rock formed from volcanic activity, while coal is a sedimentary rock formed from the compression of plant material over millions of years. Both rocks have been valuable resources to human civilizations throughout history.
What do a coal rock and a obsidian rock have in common?
Both coal and obsidian are types of rocks that are formed from cooling molten material. However, coal is primarily composed of organic matter such as plant material, while obsidian is a naturally occurring volcanic glass with a dark color and smooth texture.
What is the difference between obsidian and coal?
Obsidian is a naturally occurring volcanic glass formed from rapidly cooling lava, while coal is a sedimentary rock made from compressed plant matter. Obsidian is usually black or dark in color and has a glassy texture, whereas coal is black or brown and can be shiny or dull depending on the type. Observably, obsidian is formed from volcanic activity, while coal is formed over millions of years from plant decomposition.
How does Obsidian react to an acid?
Obsidian does not react with acid. Igneous rocks in general rarely react with acid.
Teotihuacan is famous for artifacts made from?
Volcanic rock.
Is obsidian man made?
Obsidian is an igneous rock. Rocks are not man-made. Man-made substances that are similar to rock include concrete and cement.
What is a rock made from the cooling of magma?
Igneoous rock is made from cooling of magma. Obsidian is a classic example of igneous rock.
Is obsidian metamorphic igneous or sedimentary?
Obsidian is an igneous rock.
Is obsidian rock or gemstone?
Obsidian is an extrusive igneous rock. Volcanic in origin, it is very common in recent lava flows. Obsidian is primarily made of glass. Obsidian is amorphous, lacking any crystal structure found in gemstones. For more details, try asking the question - "What is obsidian"
What does rock group does obsidian belong to?
Obsidian is in the Igneous rock group.
What is obsidian for?
Obsidian is a glasslike volcanic rock that ancient people made arrowheads and spear points from. Some of these are wonderful works of craftsmanship.
Is obsidian extrusive rock?
No. Obsidian is volcanic glass. Glass is amorphous and thus noncrystalline.
Is volcanic rock obsidian?
No. Obsidian is just one of many types of volcanic rock.
What is the obsidian rock type?
Obsidian is an extrusive felsic igneous rock.
What is the common name for obsidian rock?
The common name for obsidian rock is volcanic glass.
Dark igneous rock formed from lava?
obsidian obsidian
