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What is a extrusive rock that is actually glass?
Obsidian is an extrusive rock that is a naturally occurring volcanic glass. It occurs when lava extrudes from a quickly cooling volcano, causing little crystal growth.
Is volcanic glass an intrusive or extrusive igneous rock?
Volcanic glass is an extrusive igneous rock. It forms when molten lava cools quickly on the Earth's surface, preventing the formation of crystals.
Is volcanic glass a mineral group?
No, volcanic glass is not a mineral group. It is a type of igneous rock formed from the rapid cooling of lava without the time for crystallization to occur, resulting in an amorphous (non-crystalline) structure.
Is the obsidian rock made under earths crust?
Obsidian is a type of volcanic glass that forms when lava cools rapidly without crystal growth. It is not formed under the Earth's crust, but rather on the surface during volcanic eruptions. The rapid cooling process prevents the formation of crystals, resulting in the smooth, glassy texture characteristic of obsidian.
What is a smooth glassy black igneous rock?
The rock you are describing is likely obsidian. Obsidian is a naturally occurring volcanic glass formed during rapid cooling of lava. It is usually black in color and has a smooth, glassy texture.
What is true about volcanic glass?
Volcanic glass is the amorphous (uncrystallized) product of rapidly cooling magma.
Name given to dark volcanic glass?
Obsidian.
Smooth glassy rock that is formed when lava cools?
Obsidian
Is volcanic glass full of air spaces?
Not necessarily. Scoria and pumice are forms of volcanic glass that contain air spaces, while obsidian, another volcanic glass, contains minimal air spaces if any.
What is a extrusive rock that is actually glass?
Obsidian is an extrusive rock that is a naturally occurring volcanic glass. It occurs when lava extrudes from a quickly cooling volcano, causing little crystal growth.
Extremely rapid cooling lavA in which no crystals form?
the reterded mineral
What is considered to be volcanic glass?
Obsidian, due to its glassy texture made from the super-cooling process.
Does obsidian sink or float?
Obsidian typically sinks in water due to its high density. It is a type of volcanic glass that forms from the rapid cooling of lava, creating a material denser than water.
What is possible origin of obsidian?
Obsidian is volcanic glass, derived from the quick cooling of high silica lava.
Is volcanic glass an intrusive or extrusive igneous rock?
Volcanic glass is an extrusive igneous rock. It forms when molten lava cools quickly on the Earth's surface, preventing the formation of crystals.
What is extremely rapid cooling of lava in which no crystals form?
Extremely rapid cooling of lava results in the formation of volcanic glass, where no crystals have time to form due to the quick cooling process. This volcanic glass is also known as obsidian and has a smooth, shiny appearance.
How does obisidian form?
Obsidian is actually volcanic glass that forms when lava cools without crystalizing.
