Evidence for a permafrost layer of ice just a few meters below the surface of Mars include:
A) outflow channels and ancient river deltas.
B) "hydrated" chemical compounds found on surface rocks.
C) carbonate rock layers that are in low abundance.
D) "fluidized ejecta" craters.
E) river channels and flood plains that look identical to such features on Earth.
D
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Linus claims that the added gravitational force of neutrons holds the particles in a nucleus together. Linnea says that they stick together because they lose their electric charge when they form a nucleus. Which one, if either, is correct, and why?
a. Linus, because more particles exert gravitational forces on one another than exert electromagnetic forces. b. Linus, because the numerical magnitude of G/ke is 7.42 × 10^?21. c. Linnea, because the numerical magnitude of G/ke is 7.42 × 10^?21. d. Both, because electric charge is lost and then gravity holds the nucleus together. e. Neither, because gravity is not lost, and the numerical magnitude of ke/G is 1.35 × 10^20.
What is the sum of 1.49 + 3.212 + 1.9?
A) 7 B) 6.6 C) 6.60 D) 6.602 E) 6.6020
Which of the following regions was the result of plumes of hot mantle rising in a hot spot within a plate?
A) Alaska's Aleutian Islands B) Japan and the Philippines C) the islands of Hawaii D) the volcano Mount St. Helens E) all of the above
The Moon's crust is ________ km thick on the Earth side and ________ km thick on the far side
Fill in the blank(s) with correct word