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Glassy rocks form near or in volcanoes, or just under high pressure and heat.
For volcanoes, lava will harden on the surface for active volcanoes, and will harden inside the volcano if it's inactive.
Under normal circumstances, such as with sedimentary rocks, rocks deep within the earth will become pressurized and flatten, then heat up, creating a glassy rock.
What else can I help you with?
A smooth glassy black igneos rock?
The igneous rock you are describing is likely obsidian. Obsidian is a naturally occurring volcanic glass formed from the rapid cooling of molten lava. Its smooth, glassy texture and black color make it a popular material for decorative items and tools.
What do most fossils form in?
Most fossils form in sedimentary rock, which is created by the deposition and accumulation of sediments over time. The most common types of sedimentary rock that preserve fossils are shale, sandstone, and limestone.
What rock is form from skeletal remains pf coral and lime-secreting sea animals?
Limestone
Explain the path of one type of rock changing into another What if your path should include at least one intermediate form of rock ex sedimentary to metamorphic to igneous Be sure to include the proce?
Sedimentary rock can undergo metamorphism due to heat and pressure, transforming into metamorphic rock. This process involves recrystallization of minerals without melting. Metamorphic rock can then melt under high temperatures to form magma, which may cool and solidify into igneous rock. This transformation is known as the rock cycle.
A rock that contains fossil seashells was most likely formed as a result of?
A rock that contains fossil seashells was most likely formed as a result of sedimentation.
What is a glassy rock that forms when crystals do not get to form?
feldspar
Is glassy igneous rocks intrusive or extrusive?
Glassy igneous rocks are typically extrusive, meaning they form at the Earth's surface from rapidly cooling lava. Intrusive igneous rocks form underground from slowly cooling magma and generally do not have a glassy texture.
Do Glassy igneous rocks form when magma cools so slowly that mineral crystals cannot grow?
No, glassy igneous rocks form when magma cools so quickly that mineral crystals do not have time to form. This rapid cooling prevents the atoms in the magma from arranging themselves into a crystalline structure, resulting in an amorphous, glassy texture.
What is a glassy grained extrusive rock?
Obsidian.
What is a glassy rock?
Glassy rocks are rocks that have cooled and solidified quickly, without forming crystals. This rapid cooling prevents mineral crystals from growing, resulting in a smooth and glass-like texture. Obsidian and pumice are examples of glassy rocks.
What is the glassy variety of acidic magma?
Obsidian is a glassy rock formed from rapid cooling of acidic magma.
Lava that cools so quickly that ions do not have time to arrange into crystals will form igneous rock with a?
glassy texture, hope this helps :)
How do Igneous rock with glassy textures?
An igneous rock with a glassy texture cooled from its' liquid state very quickly, an example of this would be obsidian, a volcanic glass.
What texture of obsidian?
Obsidian is an extrusive rock that cooled very rapidly without forming crystals. As a result, obsidian has a smooth, shiny texture of a thick piece of glass.
What is a glassy fine-graind extrusive rock?
obsidian
What is a polished mineral with a glassy luster called?
a rock
What extrusive igneous rock has a mafic composition and a glassy texture?
Obsidian is an extrusive igneous rock with a mafic composition and a glassy texture. This rock forms from the rapid cooling of lava with high silica content, preventing the growth of mineral crystals and resulting in its glassy appearance.
