The greenhouse effect keeps the surface of ________ warmer than it otherwise would be.
A. Mercury
B. Earth
C. Venus
D. All of these choices are correct.
E. None of these choices is correct.
Answer: D
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A loop or sheet of gas hanging above an active region of the Sun is a(n) ________, often striking along the limb during total eclipses
A) sunspot B) flare C) aurora D) prominence E) granule
A planet (or comet) will speed up as it approaches the Sun
Indicate whether the statement is true or false
Define the solid angle.
What will be an ideal response?
A rock is dropped from the top of a vertical cliff and takes 3.00 s to reach the ground below the cliff. A second rock is thrown vertically from the cliff, and it takes this rock 2.00 s to reach the ground below the cliff from the time it is released. With what velocity was the second rock thrown, assuming no air resistance?
A) 4.76 m/s upward B) 5.51 m/s downward C) 12.3 m/s upward D) 4.76 m/s downward E) 12.3 m/s downward