Harlow Shapley used observations of globular clusters to determine the position of the center of the galaxy
a. True
b. False
Indicate whether the statement is true or false
True
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The Earth cannot contain a giant permanent magnet because
A) the Earth doesn't have enough iron. B) the core would repel it. C) the Earth isn't large enough. D) ferromagnetism disappears at high temperature. E) its magnetic field is too large.
When a rainbow of colors of light are combined into a single ray it forms
A) white. B) black. C) an intense rainbow of colors. D) It's not possible to combine colors once separated.
The unsaturated zone of soil above the water table is known as the zone of
a. permeability. b. unsaturation. c. presaturation. d. aeration.
A _________ wave is one with its oscillations perpendicular to the direction of propagation
Fill in the blank(s) with correct word