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.
C
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Glaciers were rare during the Proterozoic, as temperatures were too warm
a. True b. False
Most of the atoms in the universe are thought to be
A. helium. B. about equal amounts of hydrogen and helium. C. hydrogen. D. elements unknown at present. E. iron.
Which type of disasters was the most expensive for the insurance industry for the period 1970-2017?
A. earthquakes B. hurricanes C. floods D. winter storms
Prior to the invention of absolute dating techniques, one of the chemical dating methods useful for establishing the relative age of fossils from a single site was
a- fission track dating b- thermoluminescence dating c- electron spin resonance dating d- fluorine dating