Magnetic pole positions calculated for previous periods of geologic time from paleomagnetic measurements of rocks indicate that:
a. the earth's magnetic field is gradually growing weaker
b. the earth's magnetic field is gradually growing stronger
c. the magnetic poles have migrated great distances over the crust during geologic time
d. lithospheric plates containing the rocks have migrated great distances during geologic time.
d
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Gravitational attraction by Earth on a gliding bird pulls it downward. The reaction to this downward force is
A. the bird pulling Earth upward. B. the bird's attraction to Earth. C. air resistance by the bird on the air. D. all of the above E. none of the above
Why do scientists study glaciers to better understand climate change? What do studies of glaciers contribute to our understanding of current climate trends?
A body or rock of considerable thickness with characteristics that distinguish it from adjacent rock units is called a(n)
A. formation B. contact C. outcrop D. bedding plane
The Mughals originated in what is today:
A) Iran B) Bangladesh C) Tibet D) Mongolia E) China