Which of the following factors is most influential in causing convection in the outer core?
A) The outer core has a low viscosity, approximately equal to that of water at room temperature.
B) The outer core has a high heat conductivity.
C) Compositional differences create a difference in density.
D) Heating causes expansion of fluids.
Answer: C
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The most frequent time of day for tornadoes to form is in the:a
early morning just after sunrise. b. late morning just before noon. c. evening just after sunset. d. afternoon. e. middle of the night
La Niña events frequently follow El Niño events
Indicate whether the statement is true or false
Which principle can be used to determine the relative age of an igneous intrusion called a dike?
A. original horizontality B. superposition C. cross-cutting relations
From this cross section of the Grand Canyon, what occurred between the formation of the Precambrian metamorphic rocks and the deposition of the lowest Paleozoic rocks?
A) Uplift
B) Erosion
C) Deposition and tilting of the Precambrian sedimentary and igneous rocks
D) Uplift and erosion
E) All of these are correct.