That Earth ____ , evidence that Earth differentiated
a. rotates slowly
b. has an average density that is higher than the density of the crust
c. has a no magnetic field
d. has a surface that is 75% water
e. all of these
B
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If a length of lucite that is being used as a light pipe gets wet, the critical angle
A) decreases. B) is unaffected. C) doubles. D) is meaningless since lucite cannot be used as a light pipe. E) increases.
How do scientists study the history of life on Earth?
A) by studying fossils of ancient life only B) by comparing DNA among living organisms only C) both by studying fossils of ancient life and by using telescopes to study habitable worlds elsewhere D) both by studying fossils of ancient life and comparing DNA among living organisms E) by using telescopes to study habitable worlds elsewhere only
Statistical evidence
a. can be used to draw conclusions about a specific cases. b. is applicable to classes of objects where only a few objects from the class have been studied. c. allows scientists to determine the mechanism that produces the dust ring in Centaurus A. d. allows scientists to deduce general characteristics about a class of objects with similar properties. e. provides insight into the behavior of an individual object based on careful observations of it.
The radiation era lasted for only the first few billion years of the Big Bang
Indicate whether the statement is true or false