Many scientists suspect that Venus has a stronger and thicker lithosphere than Earth. If this is true, which of the following could explain it?
A) the apparent lack of plate tectonics on Venus
B) the slow rotation of Venus
C) the high surface temperature that has "baked out" all the liquid water from Venus's crust and mantle
D) the smaller size of Venus, which has allowed it to lose much more internal heat than Earth
C
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A particle starts from the origin at t = 0 with a velocity of 6.0
m/s and moves in the xy plane with a constant acceleration of 
m/s2. At the instant the particle achieves its maximum positive x coordinate, how far is it from the origin?
A. 36 m B. 20 m C. 45 m D. 27 m E. 37 m
In Hubble's Tuning Fork, mergers drive the arrow of time to the ________
Fill in the blank(s) with correct word
As a block slides down a 33° frictionless incline, its acceleration
a. decreases with distance. b. remains constant. c. is greatest at the bottom of the incline. d. is greatest at the top of the incline.
Although the entire universe may be much larger than our observable universe, we can see only within our observable universe. The "boundary" of our observable universe is called
A) the cosmological horizon. B) the Big Bang. C) the lookback time. D) the Hubble Deep Field.