2006-12-05 08:45:50 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
metamorphic
2006-12-05 08:47:12 · answer #1 · answered by boomer sooner 5 · 3⤊ 1⤋
Igneous rocks are the first great class. "Igneous" comes from the Latin for fire, and all igneous rocks formed by solidifying from hot, molten material. This material may have been lava at the Earth's surface, or magma (unerupted lava) at shallow depths, or magma in deep bodies (plutons). Rock formed of lava is called extrusive, rock from shallow magma is called intrusive and rock from deep magma is called plutonic.
Metamorphic rocks are the third great class of rocks. These are what happens when sedimentary and igneous rocks become changed, or metamorphosed, by conditions underground. The four main agents that metamorphose rocks are heat, pressure, fluids and strain. These agents can act and interact in an infinite variety of ways. As a result, most of the thousands of rare minerals known to science occur in metamorphic ("shape-changed") rocks. Metamorphism acts at two scales, the regional scale and the local scale.
2006-12-05 16:57:50 · answer #2 · answered by sonkysst 4 · 0⤊ 1⤋
Metamorphic Rock
Explanation
http://www.physicalgeography.net/fundamentals/10g.html
2006-12-05 16:48:52 · answer #3 · answered by belmyst 5 · 1⤊ 1⤋
metamorphic rocks !!
Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means "change in form". The protolith is subjected to heat (greater than 150 degrees Celsius) and extreme pressure causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.
2006-12-05 16:50:36 · answer #4 · answered by Geo06 5 · 0⤊ 2⤋
Please listen to the majority of people and realize that you are describing METAMORPHIC rocks. The people that said igneous should not answer questions they do not understand. Obsidian is a type of Igneous rock formed from rapidly cooling lava from an eruption - how on earth could this form from heating and pressure if it's formed after it is ejected from the earth??? (it can't)....
The guy that said Tenacious D does deserve "best answer" status, because his was the funniest (best) answer.
2006-12-05 16:57:24 · answer #5 · answered by brooks b 4 · 1⤊ 1⤋
Metamorphic
2006-12-05 16:47:23 · answer #6 · answered by Anonymous · 2⤊ 1⤋
Metamorphic.
2006-12-05 16:48:54 · answer #7 · answered by Jason 3 · 1⤊ 1⤋
igneous?
2006-12-05 16:48:17 · answer #8 · answered by stratocaster lover 2 · 0⤊ 3⤋
igneous?
2006-12-05 16:47:23 · answer #9 · answered by Cate 4 · 0⤊ 3⤋