The outer core is
a. solid.
b. liquid.
c. gas.
B
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The seasons are primarily due to
A) the distance of Earth from the Sun. B) the wavelength of solar radiation. C) the tilt of Earth's axis. D) variations in greenhouse gas levels.
What key characteristic marks the beginning stages of the collapse of a star?
A) The increase in temperature B) The depletion of carbon and oxygen C) The depletion of hydrogen D) The expulsion of energy
As a region, what is the unifying characteristic of Sub-Saharan Africa?
A) common religious beliefs B) similar livelihood systems and shared colonial experience C) shared language D) unified political system E) similar philosophy
Mid-oceanic ridges occur at ________ plate boundaries
A) synthetic B) transform C) convergent D) transverse E) divergent