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46. In which case can convection current be produced?
a. Applying heat to a substance in a container c. Dissolving a substance in a hot liquid
b. Burning a substance in a closed container d. Evaporating a substance by applying heat 47. The Earth has a magnetic field which can be proven using a magnetic compass. How does magnetic reversal
happen?
a. The N pole is transformed into a S pole c. The direction of the flow of the outer core is reversed.
a. The S pole becomes the N pole d. All of the above.
48. What geologic feature can be formed at the surface of the crust when magma rises from a hotspot?
a. trench b. mountain c. fault d. volcano
49. The breaking of a continent leads to the formation of down faulted valleys called rift valleys. How is a rift valley
formed?
a. The crust is splitting apart c. The crust is pulled downward by its weight
b. The crust is sliding past another crust d. All of the above
50. Plate A is denser than plate B. The two plates are moving towards each other. What will happen to plate A?
a. Plate A collides with Plate B. b. Plate A slides with Plate B.
c. Plate A subducts below Plate B. d. Plate A goes above Plate B.
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