2006-09-08 13:20:51 · 5 answers · asked by Anonymous in Education & Reference ➔ Primary & Secondary Education
Igneous rocks are called fire rocks and are formed either underground or above ground. Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rocks.
Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's surface. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground.
Here is another link that might help you.
2006-09-09 15:13:13 · answer #1 · answered by Anonymous · 5⤊ 0⤋
Igneous rocks are formed when molten rock (magma) cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-existing rocks in either the Earth's mantle or crust. Typically, the melting is caused by one or more of the following processes -- an increase in temperature, a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them formed beneath the surface of the Earth's crust. The word "igneous" is derived from the Latin ignis, meaning "fire".
2006-09-08 13:25:57 · answer #2 · answered by jrsgurl62 4 · 0⤊ 0⤋
rock formed by the solidification of molten magma
2006-09-08 13:25:57 · answer #3 · answered by shotohell7 2 · 0⤊ 0⤋
created by fire - usually volcanic
2006-09-08 13:26:48 · answer #4 · answered by Prof. Cochise 7 · 0⤊ 0⤋
http://mariaarvizu.tripod.com/id8.html
try this website... it defines it pretty well. :)
2006-09-08 13:27:41 · answer #5 · answered by jenn w 4 · 0⤊ 0⤋