What do astronomers generally believe about the origin of Mars' moons?
a. They formed with the planet out of the protoplanetary material.
b. They formed elsewhere and were captured at a later time.
c. They were ejected from Mars during its formation.
d. They were once a single moon and a later catastrophic event broke them in two.
B
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Indicate whether the statement is true or false
The symbol for potassium is
a. Pm. b. Po. c. P. d. K.
In a sedimentary rock that contains inclusions of metamorphic rock, the inclusions must be
A) older than the sedimentary rock. B) younger than the sedimentary rock. C) on top of the sedimentary rock. D) below the sedimentary rock.
An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the carbon tetrachloride is 20°, what is the angle of refraction into the air?
A. 20° B. 30° C. 38° D. 69° E. 26°