UIUC PS 199 - volcano sample test (1) (13 pages)

volcano sample test Multiple Choice Identify the letter of the choice that best completes the statement or answers the question 1 Volcanic belts form along a islands in the Pacific Ocean b North American mountain ranges c the boundaries of Earth s plates d the coast of Antarctica 2 The formation of the Hawaiian Islands is one example of a volcanoes forming over a hot spot b volcanoes forming along plate boundaries c the Ring of Fire d continental drift 3 The viscosity of magma depends upon its silica content and its a pahoehoe b temperature c magnetism d pyroclastic flow 4 The long tube in the ground that connects the magma chamber to Earth s surface is called the a vent b side vent c pipe d crater 5 If a volcano s magma is high in silica the volcano will probably a erupt quietly b remain dormant c erupt explosively d produce dark colored lava 6 Pahoehoe is a cooler slower moving lava b fast moving hot lava c volcanic ash d lava with a rough chunky surface 7 When groundwater heated by magma rises to the surface and collects in a natural pool it is called a a hot spring b geyser c vent d pyroclastic flow 8 In volcanic areas groundwater heated by magma is a source of a lava flows b silica c geothermal energy d pyroclastic flows 9 Which of the following volcano hazards is made up of rocky particles about the size of a grain of sand a volcanic bombs b pahoehoe 10 11 12 13 14 15 16 17 18 19 c volcanic cinders d volcanic ash The main hazard from a quiet volcanic eruption is a volcanic gases b lava flows c geysers d pyroclastic flows Tall cone shaped mountains in which layers of lava alternate with layers of ash are called a shield volcanoes b cinder cone volcanoes c composite volcanoes d lava plateaus When many layers of thin runny lava build up a high level area the result is a a lava plateau b shield volcano c cinder cone volcano d composite volcano Which type of rock would you expect to form as the result of an explosive eruption a pahoehoe b granite c pumice d aa What is the landform that forms when a mass of hardened magma is uplifted causing the layers of rock to bend upward a volcanic neck b dike c lava plateau d dome mountain The major ingredient of magma is a pahoehoe b silica c dissolved gases d obsidian What can be used to identify a substance or to predict how it will behave a stages of activity b physical and chemical properties c geothermal activity d viscosity What triggers the small earthquakes that occur around a volcano before an eruption a upward movement of magma b pyroclastic flow c cooling magma inside the crust d plate movements All of the following are examples of physical properties EXCEPT a melting point b hardness c ability to burn d density Before lava reaches the surface the molten material is called 20 21 22 23 24 25 26 27 28 a rock b magma c volcanic ash d liquid fire The volcanoes along converging oceanic plate boundaries may form a a hot spot b a part of the mid ocean ridge c an island arc d a subducting plate A mass of rock formed when a large body of magma cools inside the crust is called a a neck b dike c lava plateau d batholith A volcano that may erupt again at some time in the distant future is a active b dormant c explosive d extinct The huge hole left by the collapse of a volcanic mountain is called a a lava plateau b caldera c cinder cone d shield volcano If geologists detect many small earthquakes in the area near a volcano what can they infer about the volcano a It is dormant b It is probably about to erupt c It is extinct d It is a good source of geothermal energy Several kilometers from a volcano a geologist observes an old lava flow made up of dark colored basalt rock The geologist infers that the lava must have had a high silica content b high viscosity c low viscosity d medium viscosity When ash cinders and bombs build up in a steep pile around a volcano s vent the result is a a cinder cone volcano b shield volcano c composite volcano d dormant volcano When magma hardens in a volcano s pipe the result will eventually be a landform called a a batholith b dike c volcanic neck d sill Magma that forces across rock layers hardens into a a sill b volcanic neck c dike d batholith 29 What provides the force that causes magma to erupt to the surface a the silica in the magma b dissolved gases trapped in the magma c gravity in the lithosphere d the density of the magma 30 Which of the following helps to determine how easily magma flows a the amount of silica in the magma b the diameter of the pipe c the size of the crater d the number of vents on the volcano Modified True False Indicate whether the sentence or statement is true or false If false change the identified word or phrase to make the sentence or statement true 31 Viscosity increases as temperature increases 32 A dike forms when magma forces itself between rock layers and hardens 33 Ash cinders and bombs build up in a steep pile to form cinder cone volcanoes 34 Volcanoes that form along a mid ocean ridge occur at a n diverging plate boundary 35 Dissolved minerals trapped in magma under tremendous pressure provide the force for a volcanic eruption 36 A pyroclastic flow typically occurs during a n quiet eruption 37 A n dormant volcano is erupting or may erupt in the near future 38 Magma sometimes forces its way out of the side of a volcano through a n vent 39 During a quiet eruption a n lava flow may set fire to and then bury everything in its path 40 The greater the viscosity of a liquid the slower it flows Completion Complete each sentence or statement 41 A n is a substance that cannot be broken down into other substances 42 A substance made of two or more elements that have been chemically combined is a n 43 A mass of rock that forms when a large body of magma cools inside the crust is called a n 44 Hardened magma in a volcano s pipe that remains when softer rock around it has worn away is called a n 45 A huge hole or is left when the roof of a volcanic mountain s magma chamber collapses 46 A major volcanic belt known as the circles the Pacific Ocean 47 A liquid with little among its particles will have low viscosity 48 A n is an area where material from deep within the mantle rises and then melts forming magma 49 A quiet eruption may produce slow moving cooler lava that hardens to form …