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Igneous is volcanic in origin. There are two kinds of igneous, intrusive and extrusive. The intrusive are the only ones that can undergo change after formation because they are the only ones that would be subject to the pressures and temperatures of metamorphesis. Extrusive rocks, like obsidian and basalt are on the surface and don't change except for erosionary forces. Granite is intrusive and can be metamorphized into gneiss. Either igneous or metamorphic rocks can be eroded over time into sedimentary materials that ultimately form a new sedimentary rock that is itself metamorphized over time back into something else.

2006-11-13 09:36:47 · answer #1 · answered by rac 7 · 0 0

First, secondary rock got here from black r&b. Then there replaced into Elvis. Then the sea coast Boys, then the Brit invasion, then the boy bands and that's whilst rock imploded....they'd no longer undergo to any extent further!

2016-12-10 08:31:36 · answer #2 · answered by Anonymous · 0 0

Some pretty ugly changes. Check your text book.

2006-11-13 09:32:02 · answer #3 · answered by Everyman 3 · 0 1

hmmm um like it changes colors it breaks off

2006-11-13 09:33:25 · answer #4 · answered by CHEER[: 4 · 0 1

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