What does the texture of a rock indicate about its cooling process?
The texture is a good indicator of how the magma cooled. For example, a porphyritic
texture indicates both a slow- and a fast-cooling process took place at different times
as the magma cooled.
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The constellations were created by the Greeks
Indicate whether the statement is true or false
Given that the speed of an electron in the ground state of hydrogen is 2190 km/s, what is the speed of an electron in the n = 4 orbit of hydrogen?
A) 547 km/s B) 31,000 km/s C) 139 km/s D) 178 km/s E) 2180 km/s
The slowing of clocks in strongly curved space time is known as
a. gravitational radiation. b. time dilation. c. gravitational curvature. d. gravitational red shift. e. hyperspace drag.
The main reason that gamma photons are more penetrating than either alpha particles or electrons is that
A. They are uncharged. B. They have no rest mass. C. They travel at speed c. D. They have more energy than electrons. E. They don’t ionize atoms as electrons do.