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

Answer

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.

When magma cools at the surface, it cools rapidly and does not have time to form very large crystals. Basalt, found on the ocean floor, is an example of an extrusive igneous rock. On the other hand, magma that cools slowly beneath the Earth's surface forms rocks that contain large crystals. Geologists refer to these as intrusive igneous rocks; granite is an example of an intrusive igneous rock.

Q&A Related to "What rock is formed when magma cools at the..."
Igneous rock.
http://wiki.answers.com/Q/What_kind_of_rocks_form_...
Igneous rock is formed when molten or partially
http://www.chacha.com/question/what-type-of-rock-i...
Igneous rocks. To be more specific, Extrusive Igneous. because extrusive igneous formed from solidified magma; it describes rocks formed from molten material magma that has flowed
http://answers.yahoo.com/question/index?qid=200907...
Rocks that form from such hot liquid mantle intrusions are called igneous (meaning fire) rocks and tend to form the underlying core of most large mountain ranges. When the upper sedimentary
http://www.ehow.com/info_8248018_type-magma-cools-...
Explore this Topic
Basalt is the main type of rock in the oceanic crust. Basalt is formed when magma cools quickly at the Earth's surface, making a type of igneous rock.Though basalt ...
Magma is the molten rock material that originates under the Earth's crust and forms igneous rock when it has cooled. When magma cools and solidifies below the ...
A magma chamber is a structure made up of solidified crystal mush and molten rock located below the surface of the Earth. When a magma chamber solidifies and cools ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com