Question 38-40 For questions 29 through 42 please refer to Figure 5 Questions 29

Question

Question 38-40

For questions 29 through 42 please refer to Figure 5 Questions 29 through 42: Matching: Match each statement to the volcanic construct that best fits. Note shape and size will help you here. 29. 30. 31. 32. 33. Maar. Cinder cone Composite cone (aka: stratovolcano) Shield Volcano. Lava Plateau. A. Volcano x B. Volcano y C. Volcano z D. None of the constructs matches the statement. Typical of a subduction zone setting. Entirely composed of Silicic (Felsic) Lava (Rhyolitic Lava) Of the three constructs shown on Figure 5, the one formed from lava with the greatest silicon to oxygen ratio. (hint: it cannot be "D") Hot Spot note: pick only the construct more likely formed at a hot spot. Flood Basalt note: as opposed to simple basalt flows. Explosive eruptions Basalt flows. Pyroclastic (tephra) only. Alternating layers of pyroclastic flows and lava. 34. 35. 36. 37. 38. 39. 40. 41. 42. For questions 43 through 45 please refer to the magnetic lineations of the seafloor across mid-ocean

Explanation / Answer

38. Flood basalt: volcano z

The reason I chose volcano z is that the flood basalt usually coats large stretches of land or ocean floor ranging up to thousands of square km. They tend to spread for distances that are roughly proportional to the third power of their thickness. As shown in the fig., the volcano z come very close to this description than the other two.

39. Explosive eruptions: volcano x

The explosive volcanoes usually build composite volcano or stratovolcano. They are usually conical in shape and can be characterized by a steep profile. The volcano x comes close to this description.

40. Basalt flows:  volcano y

Basalt flows are noneruptive, voluminous, and characterized by relatively low viscosity. They generally advance less than one mile or kilometre per hour on gentle slopes and may reach more than 30 mi (50 km) from their source or erupting vent. Volcano y comes close to this description.

Do verify them again looking closely at the original picture.

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