Circular Earth orbits are characterized by a constant
A. radial distance.
B. acceleration.
C. speed.
D. all the above
Answer: D
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Which chemical family is composed almost entirely of man-made elements?
A) the actinides B) the lanthanides C) the halogens D) all of the above E) none of the above
The end of Earth’s life cycle will occur as a result of the sun’s ____ phase
a. supernova b. red giant c. protostar d. nebula e. accretion
What is the most important agent for modifying the equilibrium profile of beaches? What will be an ideal response?
Which of the following is not used to rate an earthquake on the moment magnitude scale?
A) the amount of death and destruction that occurred B) the amount of fault slippage that occurred C) the nature of the materials that faulted D) the size of the subsurface or surface area that ruptured