In using a magnet to find north, the term "declination" represents
A)
the degree of weakness of the magnetic field.
B)
the angle above the horizontal of the earth's magnetic field.
C)
another term for "angle of dip."
D)
the angle below the horizontal of the earth's magnetic field.
E)
not given
E
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the magnetic field in the primed frame.
A. A B. B C. C D. D E. Toward the viewer F. Away from the viewer T. There is no field of this type.
During the Pleistocene ice age
A) there was one large episode of glacial advance. B) there were several episodes of glacial advance and retreat. C) Earth's entire surface was covered with ice. D) Earth's oceans were completely frozen.
As a system becomes more disordered, entropy
A) increases. B) decreases. C) remains the same.
Based on the number of galaxies visible in the Hubble Deep Field (Figure 16.1 in your textbook), the estimated number of galaxies in our observable universe is about ________
A) 50,000 B) 100 million C) 100 billion D) Infinity