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Igneous rock usually appears with a well mixed texture without fossils, bands or layers, may contain vesicles (air bubbles or holes from trapped gases) and does not react with dilute acid.
Igneous rocks can:
- Be glassy or frothy in appearance.
- Be felsic, intermediate, mafic, or ultramafic in nature.
- Be porous or full of bubbles.
- Have large crystal structure like granites.
- Have small crystal structure like basalts.
- Have a combination of large and small interlocked crystals.
- Be more dense than other rock types.
- Have an interlocking crystalline structure.
- Appear to be peppered with black specks.
- Be light enough to float (pumice).
Wiki User
∙ 13y ago
Wiki User
∙ 10y agoyou simply look at the ROCK and predict if its extrusive igneous or Not
Wiki User
∙ 11y agoIntrusive igneous rock is composed of visible mineral crystals, possessing what is referred to as a phaneritic texture. This is evidence that slow cooling of magma occurred deep underground.
Anonymous
You identify by looking to see if there are any crystals that you can simply see. If you cannot see any crystals, that means that it is extrusive. If it is intrusive, you have to be able to see crystals.
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Identify four extrusive igneous rock structure?
Extrusive igneous rock structures: Lava flow or plateau, Volcano (many types), Crater, Caldera, Fissure.
What type of rock forms when molten rock cools?
Rock that forms from molten rock that cools and solidifies is called igneous rock.
Type of rock formed from molten rock?
Igneous rock is formed when magma cools and becomes solid.
What kind of rock is formed after a volcano erupts?
Extrusive igneous rock such as basalt, rhyolite, pumice, and obsidian.
What is igneous rock formed from magma below Earth's surface is called?
It is called an intrusive igneous rock.
What are two ways you could identify igneous rock?
When it has holes and small rocks inside the rock
What are two characteristics that can be used to identify intrusive igneous rock?
oil and gas
Identify four extrusive igneous rock structure?
Extrusive igneous rock structures: Lava flow or plateau, Volcano (many types), Crater, Caldera, Fissure.
How can you identify an igneous rock?
Intrusive igneous rock is composed of visible mineral crystals, possessing what is referred to as a phaneritic texture. This is evidence that slow cooling of magma occurred deep underground.
What is the best way to identify if a rock is sedimentry igneous or metamorphic?
to know if a rock is sedimentary you can destroy the rock and you will have a high chance of finding fossils.thank me later
What type of rock forms when molten rock cools?
Rock that forms from molten rock that cools and solidifies is called igneous rock.
What describes rock that was formed when molten rock cooled down?
Igneous rock is formed.
What type of rock is a pumice rock?
an igneous rock.
Type of rock formed from molten rock?
Igneous rock is formed when magma cools and becomes solid.
Is obsidian metamorphic igneous or sedimentary?
Obsidian is an igneous rock.
What kind of rock is formed after a volcano erupts?
Extrusive igneous rock such as basalt, rhyolite, pumice, and obsidian.
When magma is cooled it becomes what?
Cooling and solidifying magma turns into igneous rock.
