Glacial striations on the continental landmasses provide evidence
A) that Hawaii was once joined to Alaska.
B) of the direction of Pleistocene ice flow.
C) that the Cenozoic was a very cool time.
D) that Baja California was once joined to Mexico.
Answer: B
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How does the solar nebula theory explain the present densities and chemical compositions of the planets?
What will be an ideal response?
Which of the following factors in the simplified Drake equation is best known?
A) Nhp, the number of habitable planets in our galaxy B) fciv, fraction of life-bearing planets where intelligent civilizations have arisen at any time C) fnow, fraction of civilization-bearing planets that have intelligent civilizations on them now D) flife, fraction of life-bearing habitable planets
On the main sequence, stars obtain their energy
A) by converting helium to carbon, nitrogen, and oxygen. B) from nuclear fission. C) by converting hydrogen to helium. D) from gravitational contraction. E) from chemical reactions.
"Firewalkers" step on the hot ashes and coals from a wood fire without getting their feet burned. How might this be possible?
a. They have magical powers. b. The ashes are poor conductors of heat. c. They do get burned but enjoy the publicity. d. none of the above