Describe the four stages in the development of a terrestrial planet
What will be an ideal response?
(1) Differentiation, the separation of material into layers according to density. (2) Cratering, meteorite impacts, which can't occur until a solid surface forms. (3) Flooding, molten rock or water flowing over the surface. (4) Slow surface evolution, which includes erosion and plate tectonics.
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Discuss the evidence we have that the surface of Venus is marked by volcanism
What will be an ideal response?
The mass of a single galaxy might be found by
a. the double galaxy method. b. the rotation curve method. c. the cluster method. d. any of these methods. e. none of these methods.
Power: When 5.00 A is flowing through an 10.0-? device, how much power is being dissipated in the device?
A. 50.0 W B. 250 W C. 500 W D. 2.50 kW
An electron is fired through a pair of deflection plates, which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity. If the initial speed of the electron is 
how long does it take to traverse the plates?
A. 2.00 ?s B. 2.00 ns C. 1.70 ns D. 1.80 ns E. 1.50 ?s