Problem 1
Type \(195348.36 \mathrm{~N} 1553458.11 \mathrm{~W}\) in the search bar on Google Earth, and zoom out to an eye altitude of \(\sim 615\) miles. The magma that resulted in the formation of these islands was generated by what process? a. decreased pressure (arrow "b") b. the addition of water (arrow "d", which shifts the solidus to the left) c. increased temperature (arrow "a")
Problem 2
Type \(501627.25 \mathrm{~N} 292205.11 \mathrm{~W}\) in the search bar on Google Earth, and zoom out to an eye altitude of \(\sim 2663\) miles. The magma generated at this location is due to: a. decreased pressure (arrow "b") b. the addition of water (arrow "d", which shifts the solidus to the left) c. increased temperature (arrow "a")
Problem 4
Type “San Andreas Fault” in the search bar on Google Earth; no magma is generated here, because this plate boundary is _____________________. a. a divergent plate boundary, with decompression melting occurs b. a convergent plate boundary, where water lowers the melting temperature of rock c. a transform plate boundary, where no magma is produced
Problem 5
A(n) ________________________ at the Mid-Ocean Ridge, where oceanic plates are diverging and magma is generated by partial melting of the mantle. a. ultramafic magma is produced b. mafic magma is produced c. intermediate magma is produced d. felsic magma is produced
Problem 6
Type 19 28 19.70 N 155 35 31.94 W in the search bar on Google Earth, and zoom out to an eye altitude of ~119 miles. This volcano is composed of: a. mafic rocks, because a hotspot partially melted the mantle below the oceanic crust b. mafic rocks, because a hotspot partially melted the oceanic crust c. ultramafic rocks, because a hotspot partially melted the mantle below the oceanic crust d. ultramafic rocks, because a hotspot partially melted the oceanic crust
Problem 7
Type 35 35 08.45 S 70 45 08.22 W in the search bar in Google Earth. This volcano formed from an intermediate magma type, because: a. subduction of oceanic crust beneath the continental crust occurs here b. continental crust is subducting, causing magma to form c. a hot spot is partial melting the continental crust d. this is the result of a divergent plate boundary
Problem 9
Intermediate lavas can flow _____ than mafic lavas, due to the _______viscosity. a. slower, higher b. slower, lower c. faster, higher d. faster, lower
Problem 10
Let’s relate food items to magmas of different viscosity; if we compare how honey and water flow when poured from a container: a. then the honey represents felsic magma, and the water represents mafic magma b. then the honey represents mafic magma, and the water represents mafic magma.
Problem 11
Imagine putting the honey in the refrigerator overnight; will its viscosity be affected? a. yes; the viscosity will increase b. yes, the viscosity will decrease c. no. there will be no change as the composition stays the same
Problem 12
Keep the honey in mind while you answer this question: when it is first erupted, basalt lava typically erupts at \(1200^{\circ} \mathrm{C} ;\) after flowing away from the vent, the temperature falls, therefore the viscosity of the basaltic lava will: a. increase b. decrease c. stay the same
