| 1. | Examples of extrusive rocks include basalt, rhyolite, andesite, obsidian and pumice.
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| 2. | Over large areas extrusive rocks lie in flat undisturbed piles on a Cenozoic surface of moderate relief.
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| 3. | Torfaj�kull last erupted in 1477 and consists of the largest area of silicic extrusive rocks in Iceland.
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| 4. | Over large areas extrusive rocks lie in flat undisturbed piles on a Tertiary surface of moderate relief.
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| 5. | Many of the extrusive rocks and some of the Pseudoleucite is an abundant constituent of many of the igneous rocks.
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| 6. | Rhyolite is the same as granite chemically; however it is an extrusive rock, whereas granite is an intrusive rock.
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| 7. | In contrast, an " extrusion " consists of extrusive rock; rock formed above the surface of the crust.
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| 8. | Because extrusive rocks make contact with the atmosphere they cool quickly, so the minerals do not have time to form large crystals.
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| 9. | From 1951 to 1954, Coats was engaged in the search for radioactive granitic rocks, and in field studies of rhyolitic extrusive rocks.
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| 10. | Intrusions are one of the two ways igneous rock can form; the other is extrusive rock, that is, a volcanic eruption or similar event.
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