extrusive
2006-12-04 03:42:34 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Earth Sciences & Geology
Doubtlessly the regional metamorphism has produced the greatest amount of metamorphic rocks. Contact metamorphism is only a local phenomenon, while intrusive and extrusive rocks are igneous rocks, unless they undergo some metamorphism afterwards. Intrusive and extrusive igneous activity sometimes metamorphoses the existing country rocks, limited to a small aerial extent.
2006-12-06 18:14:48 · answer #1 · answered by saudipta c 5 · 0⤊ 0⤋
I am guessing - but I think regional metamorphism. Why? Because there are entire mountain ranges composed of metamorphic rocks that formed because of tectonic activity. Zones of contact metamorphism are are small, and outside of contact zones, intrusions and extrusions are not metamorphic unless they undergo change after they are initially deposited.
2006-12-04 06:28:20 · answer #2 · answered by formerly_bob 7 · 0⤊ 0⤋