Which layer is believed to behave most like a liquid?
A. Crust
B. Lithosphere
C. Outer core
D. Inner core
E. Mantle
Answer: C
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The major factors in glacial periods lasting tens of millions of years appear to be ________.
A. an increase in volcanic activity and excess amount of methane in the atmosphere B. a long-term cooling of the Sun and extended periods of maximum axial tilt C. having one or more large continental masses near the poles and oceanic circulation that is more longitudinal (north-south) than latitudinal (east-west) D. having one or more large continental masses near the equator and extended periods of minimum axial tilt of Earth E. minimum rates of coral and limestone formation and the existence of a supercontinent
____ are a type of lithostratigraphic unit with distinctive upper and lower boundaries
A)Biozones B)Stratotypes C)Formations D)Systems E)Zones
Judge the following sentence according to the criteria given below
In barrier-island shorelines tidal currents are much stronger in tidal inlets between adjacent islands than on the nearby tidal flats because neap tides occur when the Moon's gravitational attraction is oriented perpendicular to that of the Sun. A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct but the reason is incorrect. D) The assertion is incorrect but the reason is correct. E) Both the assertion and the reason are incorrect.
The ion that has the longest residence time in the ocean is ________
a. silicon b. iron c. aluminum d. chloride