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What feature in igneous rocks is the best indication of how rapidly the magma crystallized?
Wiki User
∙ 13y ago
The size of the crystals. Large crystals mean the magma cooled slowly, small crystals are a sign that the magma was cooled quickly.
Wiki User
∙ 13y ago
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Difference between an intrusive and extrusive igneous rock?
Intrusive igneous rocks by definition, are formed and set underground. As well as the well-crystallized Granites and Basalts, they also include rapidly-chilled rocks such as dykes and sills.Extrusive igneous rocks have been deposited on the Earth's surface, and include all the usual volcanics.
Some extrusive igneous rocks such as obsidian are glassy because they?
cool rapidly
How some extrusive igneous rocks such as obsidian are glassy is because they?
Cool rapidly
True or false intrusive igneous rock forms small crystals because it cools rapidly?
False
What are two types igneous rocks?
Granite and basalt are the most common types of igneous rock. Igneous rock types, or classifications, also include those that are intrusive and extrusive. Intrusive igneous rock is formed from the solidification of slow cooling magma below the surface. Extrusive igneous rock is formed for the solidification of rapidly cooling lava at or near the surface.
Difference between an intrusive and extrusive igneous rock?
Intrusive igneous rocks by definition, are formed and set underground. As well as the well-crystallized Granites and Basalts, they also include rapidly-chilled rocks such as dykes and sills.Extrusive igneous rocks have been deposited on the Earth's surface, and include all the usual volcanics.
What type of Igneous rock forms when lava cools rapidly on the earth's surface?
Extrusive igneous rock.
Do Coarse-grained igneous rocks cool rapidly from magmas?
no
What is the structure of an igneous rock?
the structure of an igneous rock is metamorphic rock that has been heated rapidly and turned into magma then cooled to create igneous rock its gay
Igneous rock that forms on Earth's surface is called?
It's called extrusive igneous rock--rapidly solidified lava.
Some igneous rocks such as obsidian are glassy because they?
cool rapidly
What kind of texture does igneous rock have when it cools rapidly?
coarse texture
Some extrusive igneous rocks such as obsidian are glassy because they?
cool rapidly
How some extrusive igneous rocks such as obsidian are glassy is because they?
Cool rapidly
What rock is black glassy and was formed by rapidly cooling lava?
The answer is pitchstone. it is and igneous rock.
Intrusive igneous rock forms small crystals because it cools rapidly.?
false
What does a fine-grass igneous rock forms?
A fine grained igneous rock forms from Lava that escapes from the earth crust to the surface and cools and solidifies rapidly.
