Q:

What is a fine-grained igneous rock?

A:

A fine-grained igneous rock is a rock that is formed by melted magma cooling so quickly at the surface of the Earth that only tiny crystals form, most too small to be seen with the naked eye. Basalt is an example of such a rock.

When melted magma cools, igneous rock forms. When the magma cools at the surface of the earth, it cools more quickly and forms extrusive igneous rocks, which have a finer texture. When it cools slowly beneath the Earth's surface, intrusive igneous rocks form. These rocks have large crystals. Granite is an example of intrusive igneous rock.


Is this answer helpful?

Similar Questions

  • Q:

    What is sedimentary rock?

    A:

    Sedimentary rocks are formed by the deposition of mud, clay, sand and other small particles on the surface of the Earth. Sedimentation can occur in many different environments, including lakes, rivers, deserts and oceans. The sediment is deposited in layers that are compressed over time and turned into solid rock.

    Full Answer >
    Filed Under:
  • Q:

    What is an an igneous rock that contains vesicles?

    A:

    Pumice is a common igneous rock that is extremely light and porous as a result of the many vesicles in its structure. These vesicles form as a result of the large quantity of gas that was dissolved in the magma from which the rock cooled.

    Full Answer >
    Filed Under:
  • Q:

    What rock is formed when magma cools at the Earth's surface?

    A:

    The specific type of rock that forms when magma cools at the Earth's surface is extrusive igneous rock. Igneous rock forms when magma cools, but where the magma cools determines the type of igneous rock that forms. Igneous rock gets its name from the Greek word for fire and is so called due to the extremely hot liquid from which the rocks originate.

    Full Answer >
    Filed Under:
  • Q:

    When was the planet Jupiter discovered?

    A:

    As one of the five planets visible from the Earth with the naked eye, Jupiter was independently seen and discovered by many ancient civilizations. While no specific year can be definitively attributed to Jupiter's discovery, the Babylonians first recorded seeing it in either the seventh or eighth century B.C.

    Full Answer >
    Filed Under:

Explore