Which three Galilean moons were found by Galileo to have weak, changing magnetic fields?
A) Titan, Callisto, and Amalthea
B) Io, Europa, and Callisto
C) Io, Amalthea, and Ganymede
D) Io, Europa, and Ganymede
E) Europa, Ganymede, and Callisto
E
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Any star that is more luminous than the Sun, but has the same temperature as the Sun, is a(n) ____
a. pulsating star b. white dwarf c. zero age main sequence star d. giant e. brown dwarf
The hydrogen in the universe was formed by
a. the energy of the Big Bang. b. nuclear fusion reactions in stars. c. radioactive decay of heavy elements. d. none of the above.
As rock is weathered it breaks down and erodes. Sedimentation begins where erosion stops. Erosion is
A) disintegration and fragmentation of rock into smaller pieces. B) a chemical process. C) decomposition and alteration of rock material. D) transportation of rock particles via water wind or ice.
The two main distinguishing characteristics of an air
mass are a) size and shape. b) pressure and wind speed. c) cyclonic rotation and speed of movement. d) temperature and moisture content