44 What mechanism produces the Hawaiian shield volcanoes a M

44. What mechanism produces the Hawaiian shield volcanoes? a. Movement of oceanic lithosphere over a mantle hot spot b. Melting of continental lithosphere beneath Hawaii c. Formation of a new Pacific plate boundary d. Silicic lava with high volatile content 45. Which of the following Composite Volcano Hazards travels the greatest distance? a. Pyroclastic Flow b. Lava Flow c. Lahar d. Debris Avalanche 46. Which of the following correctly describes volcano CO2 emissions? a. Annual volcano CO2 emissions far exceed emissions from human activities b. Annual volcano CO2 emissions are a fraction of emissions from human activities c. Volcanoes do not produce CO2 emissions d. None of the above 47. Which of the following is not a possible characteristic of an extrusive igneous rock? a. Vesicular b. Aphanitic c. Phaneritic d. Porphyritic 48. The rate of cooling of an igneous rock can be determined by the a. silica content b. color c. quartz content d. texture 49. What extrusive, aphanitic, igneous rock is composed of the same mineral percentages as a gabbro? a. Rhyolite b. Andesite c. Granite d. Basalt 50. Which of the following igneou s rocks has the largest silica content? a. Granite b. Basalt c. Andesite d. Gabbro

Solution

Answer for 44 - a

Answer for 45 - a

Answer for 46 - a

Answer for 47 - c

Answer for 48 - d

Answer for 49 - d

Answer for 50 - a