whay is it correct to say that igneous rocks may form from the instrusion of lava?

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whay is it correct to say that igneous rocks may form from the instrusion of lava?

2006-09-19 06:11:36 · 3 answers · asked by abdirashid A 1 in Science & Mathematics ➔ Earth Sciences & Geology

3 answers

Well, it's mostly right.

Igneous rocks both form extrusively (lava, like the basalt in Hawai'i) and intrusively (underground, like granite). Technically, lava is on the survace, so you can not have an intrusive lava. You would have to say 'an intrusion of magma' and 'surface cooling of lava.'

2006-09-19 06:54:09 · answer #1 · answered by QFL 24-7 6 · 1⤊ 0⤋

Other magmatic intrusives include diabase, which forms as sills and dikes between other types of rocks.

2006-09-19 10:30:47 · answer #2 · answered by Tom-PG 4 · 0⤊ 0⤋

Because it IS true.

2006-09-19 06:14:30 · answer #3 · answered by Anonymous · 0⤊ 1⤋