GEOL 1001 Chapter : Chapter 5 - Volcanic Eruptions
Document Summary
Products of eruption: lava ow: (e usive eruptions) Lava travels a few kilometers up to 600 km. Pahoehoe - ropey texture a" a" - jumble of sharp fragments. Most viscous of all lavas - most silica. Not going to ow - creates a dome above the vent. Blockier volcanic products: pyroclastic ow: (explosive eruptions) (cid:12254) (cid:12254) Silica-rich rocks are more likely to be gaseous. Ignimbrite - an explosive eruption that creates ash fall, ow, sheet of tu formed from pyroclastic ow. Happens when your volcano is covered in snow or it"s is raining: volcanic gas (cid:12254) (cid:12254) (cid:12254) (cid:12254) (cid:12254) Up to 9% of the lava can be gas. H2o, co2, so2 (sulfur dioxide), h2s (hydrogen sulfate) 1 eruption (cid:12254) (cid:12254) (cid:12254) (cid:12254) (cid:12254) (cid:12254) (cid:12254) (cid:12254: strato volcano (composite) Move slowly, so human life is usually saved. Change climate because the ash particles block sunlight. Global cooling can last for tens of thousands of years.
