earthquakes chpt 8 study guide

Why does the magma from some volcanoes flow smoothly

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12. Why does the magma from some volcanoes flow smoothly and relatively peacefully, while the magma from other volcanoes blasts forth violently and deals death over wide areas? A. differences in the chemical and mineral makeup of magmas B. variations in the temperature, water and gas content, and viscosity of magmas C. different geographic positions with respect to hot spots and edges of tectonic plates D. All of these are correct. E. None of these are correct.
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13. Slow flowing, more viscous basaltic lava commonly has a rough, blocky texture called __________. 14. If basaltic lava reaches the sea or a lake, it cools rapidly into ______________. 15. Areas of geyser activity include _________. 16. The volcanic explosivity index (VEI) measures size of volcanic eruptions on a scale of 0 to 8. Between 1500 and 1981, one VEI 7 eruption occurred. This was ________________. A. Tambora, in 1815 B. Krakatau, in1883 C. Mt. St. Helens in 1980 D. Mt. Pelee in 1902 E. Mt. Vesuvius in 1631 17. The three Vs of volcanology are ____________________. 18. A shield volcano has a great _____________. 19. Hawaiian volcanoes capable of eruption include ___________________.
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20. The most peaceful eruptions are _______________. A. Icelandic type B. Plinian eruptions C. Strombolian eruptions D. Vulcanian eruptions 21. On 20 February 1943, a new volcano, a scoria cone, was born when an eruption rose up through a farm field near a village in Mexico. The volcano is __________________. 22. __________ are steep-sided, symmetrical volcanic peaks built of alternating layers of pyroclastic debris capped by high-viscosity andesitic to rhyolitic lava flows that solidify to form protective caps.
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