At divergent boundaries, basaltic magma is generated by
A. Partial melting of mantle rock
B. Partial melting of continental crust
C. Partial melting of ocean crust
Ans: A. Partial melting of mantle rock
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Quasars are most common in the redshift range of _____
A) 0.6 to 1.5 B) 2 to 2.7 C) 3.2 to 4 D) 5 to 5.8
Velocity Addition: A person in a rocket ship traveling past the earth at a speed of 0.500c fires a laser gun in the forward direction. With what speed does an observer on Earth measure for the light pulse?
Fill in the blank(s) with the appropriate word(s).
Which of the following is the largest distance?
A) diameter of a typical galaxy B) diameter of Pluto's orbit C) distance to the nearest star (other than our Sun) D) 1 light-year
Which of the following is TRUE?
A) Visible light makes up the greatest part of the electromagnetic spectrum. B) In a vacuum, electromagnetic waves all travel at the same speed, the speed of light. C) Ultraviolet light has the shortest wavelength of any electromagnetic wave. D) A blackbody emits all its radiation at a single wavelength or frequency. E) Electromagnetic waves cannot travel through empty space.