Most ________ rocks are devoid of fossils, which hinders correlation of rocks
A) Cenozoic
B) Precambrian
C) Mesozoic
D) Mesozoic and Cenozoic
E) Paleozoic
B
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Which is not a factor that leads geologists to expect that convection in the mantle is likely?
A) Viscosity in the lithosphere is high. B) Viscosity beneath the lithosphere is lower because the rock is close to its melting temperature. C) Some of the lithosphere is denser than the asthenosphere. D) The thickness and mass of the mantle are huge.
What statement most accurately describes the theory of seafloor spreading?
A)Subduction zones produce oceanic crust that moves away from these zones by seafloor spreading toward mid-oceanic ridges where it is consumed. B)Oceanic crust continuously forms across the seafloor and is moved by subduction zones toward mid-oceanic ridges where it is consumed. C)Oceanic crust continuously forms at mid-oceanic ridges, moves away from these ridges by seafloor spreading, and is consumed at subduction zones. D)Earth's molten core material erupts at mid-oceanic ridges, moves away from these ridges by seafloor spreading, and is consumed at subduction zones. E)Subduction zones force oceanic crust to spread across the seafloor before being consumed at a fault valley.
"Heat mining", a new means of energy generation that is currently being studied, relies upon what known characteristic of Earth?
A. Relatively thin nature of the oceanic crust B. Presence of a liquid outer core C. Geothermal gradient D. Magnetic field
Certain rock types can be used to determine the locations of past magnetic poles because ____
a. the Earth's magnetic poles have reversed many times during its history b. the magnetic poles and geographic poles differ slightly c. iron-bearing minerals align themselves in the direction of the current magnetic field when the rock cools below the Curie point d. lava flows in Europe all showed that the continent was once located in the southern hemisphere e. the north magnetic poles of each continent are identical for each geological period