The circular flow of rising hot material and sinking cool material is responsible for what phenomena on and in Earth?
A. rifting
B. volcanic eruptions
C. earthquakes
D. subduction
E. All of these choices are correct.
Answer: E
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How might we tell whether the Universe is open or closed?
What will be an ideal response?
To maximize the magnification of a refracting telescope, what lenses should you choose?
A) The objective lens should have a small focal length and the eyepiece should have a large focal length. B) The objective lens and eyepiece should both have large focal lengths. C) The objective lens and eyepiece should both have small focal lengths. D) The objective lens should have a large focal length, but it doesn't matter what the focal length of the eyepiece is. E) The objective lens should have a large focal length and the eyepiece should have a small focal length.
A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. It is then disconnected from the battery and the plates are pulled apart to a separation 2d without discharging them. After the plates are 2d apart, the new capacitance and the potential difference between the plates are what?
A.
C0, 
V0B.
C0, V0C.
C0, 2V0D.
E.
Which of the following is not an example of condensation at Earth's surface?
A) clouds B) dew C) frost D) fog