A bar magnet that holds a chain of nails illustrates
A) magnetic field displacement.
B) magnetic induction.
C) electromagnetic induction.
Answer: B
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Why is continental crust lower in density than seafloor crust?
A) Continental crust is made of rock, while seafloor crust has more metals. B) Continental crust is made from volcanic rock called basalt, which is lower in density than what the seafloor crust is made from. C) Continental crust is made from remelted seafloor crust and therefore only the lower-density material rises to form it. D) Continental crust is actually denser than seafloor crust. E) Seafloor crust is more compact due to the weight of the oceans, but it is made of the same material as the continental crust.
Venus can appear as a crescent through the telescope
Indicate whether the statement is true or false
The dip angle is:
a. another term for magnetic declination. b. a measure of the tendency for a compass to point south. c. close to or at zero near the equator. d. close to or at zero just north of Hudson Bay.
One number has three significant figures and another number has four significant figures. If these numbers are added, subtracted, multiplied, or divided, which operation can produce the greatest number of significant figures?
a. the addition b. the subtraction c. the multiplication d. the division e. All the operations result in the same number of significant figures.