2006-12-05 12:09:12 · 5 answers · asked by ramiro0421@sbcglobal.net 1 in Science & Mathematics ➔ Earth Sciences & Geology
According to wikipedia:"Igneous rocks make up approximately ninety five percent of the upper part of the Earth's crust."
"igneous rocks are formed from magma that cools and solidifies "
It sounds to me like that would be all volcanos.
For an online tutorial of igneous rocks, see the link I have found for you.
2006-12-05 12:23:34 · answer #1 · answered by Yarnlady_needsyarn 7 · 0⤊ 0⤋
Igneous rocks are formed from magma, which comes from volcanoes. So while not all volcanoes actually contain igneous rocks, all igneous rocks come from volcanoes.
2006-12-05 20:53:34 · answer #2 · answered by confusedinTX 2 · 0⤊ 0⤋
All volcanoes, other than "mud volcanoes" or their ilk, are extrusive igneous rocks.
2006-12-06 13:51:24 · answer #3 · answered by Amphibolite 7 · 0⤊ 0⤋
ALL IGNEOUS ROCKS ARE FORMED DUE TO VOLCANIC ACTIVITIES; SUBMERGED, SUB SURFACE OR OPEN - FROM MOLTEN MAGMA
2006-12-06 10:10:33 · answer #4 · answered by MANU 1 · 0⤊ 0⤋
i say all
2006-12-05 23:18:17 · answer #5 · answered by lucky77 3 · 0⤊ 0⤋