Question
intrusive or extrusive?
formed from molten rock.
formed from molten rock.
Answers
GPT-4o mini
The terms "intrusive" and "extrusive" refer to where and how igneous rocks are formed from molten rock:
- **Intrusive (or plutonic) rocks**: These are formed from magma that cools and solidifies below the Earth's surface. Because they cool slowly, intrusive rocks typically have large, well-defined crystals. An example of an intrusive rock is granite.
- **Extrusive (or volcanic) rocks**: These are formed from lava that cools and solidifies on the Earth's surface. They cool quickly, which usually results in smaller crystals or a glassy texture. An example of an extrusive rock is basalt.
So, if the rock is formed from molten rock that cools and solidifies below the surface, it is intrusive. If it cools and solidifies on the surface, it is extrusive.
- **Intrusive (or plutonic) rocks**: These are formed from magma that cools and solidifies below the Earth's surface. Because they cool slowly, intrusive rocks typically have large, well-defined crystals. An example of an intrusive rock is granite.
- **Extrusive (or volcanic) rocks**: These are formed from lava that cools and solidifies on the Earth's surface. They cool quickly, which usually results in smaller crystals or a glassy texture. An example of an extrusive rock is basalt.
So, if the rock is formed from molten rock that cools and solidifies below the surface, it is intrusive. If it cools and solidifies on the surface, it is extrusive.