What is the main visual difference between the lunar maria and the rest of the lunar surface? What are the implications of this observation?
What will be an ideal response?
The lunar maria are generally smooth compared to the rest of the Moon. The difference in the amount of craters shows that the maria formed more recently than the rest of the lunar surface, at the end of the heavy bombardment phase of the solar system.
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Which of the following statements is true of the rings of Jupiter?
A) They must be made of icy material. B) They look bright when illuminated from front. C) They look light and bluish. D) They must be continuously resupplied with new dust.
Which involves a larger number of calories?
A) the condensation of 1 gram of steam at 100°C to water at 100°C B) the cooling of 1 gram of water at 100 degrees Celsius to 1 gram of ice at absolute zero C) both the same D) none of these
Mrs. Jones went on a diet and lost 15 kilograms. How many pounds did she lose?
A) 68 pounds B) 42 pounds C) 38 pounds D) 33 pounds E) 6.8 pounds
The "alpha" particle is
A. two electrons bound to two protons. B. two protons bound to two neutrons. C. a photon. D. an electron. E. two electrons bound to two neutrons.