GEOL 1001 Lecture : Lecture 9 30 201

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15 Mar 2019
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Volcano builds above sea level to form an island. Lava builds upward and outward and the island grows. Submarine slump remove large masses of the volcano. The permian mass extinction: greatest ever on earth. Cover parts of russia and china (siberian traps) Though 60% of all genera end, many new forms quickly develop. Material can circle in atmosphere for long periods of tine. This coexistence has both bad and good facet. Volcanic soils are highly fertile; excellent for crops. It is rare for lava flows to kill people. Can completely bury landscape almost instantly killing plants and crops. When mixed with water turns into cement like substance. Clouds of roiling ash and gas race downslope. Nevada del ruiz, colombia, buries armero +25000 people. Dormant-has not erupted in 100s to 1000s of years, but could still do so. These signs indicate that an eruption is imminent.

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