Mixing pigments is an example of the ________ method of color production
A) complementary
B) subtractive
C) additive
D) composite
E) "tri-color"
B
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Fine silica flour (fine powder) added to a polymer is a(n) _____________.
Fill in the blank(s) with the appropriate word(s).
Current statistical evidence suggests that Earth-sized planets orbiting in the habitable zone are
A) extremely rare. B) likely to exist around at least about 20% of all stars. C) found around virtually all stars.
Why does Earth have the strongest magnetic field among the terrestrial worlds?
A) It is the only one that has a metallic core. B) It rotates much faster than any other terrestrial world. C) It is the only one that has both a partially molten metallic core and reasonably rapid rotation. D) It is by far the largest terrestrial world. E) It is the most volcanically active world.
What does Hubble's law tell us?
A) The longer the period of a Cepheid variable, the greater its luminosity. B) The more distant a galaxy, the faster it is moving away from us. C) The faster a spiral galaxy's rotation speed, the more luminous it is. D) For every force, there is an equal and opposite reaction force.