The greenhouse effect occurs because carbon dioxide is opaque to infrared radiation.
Indicate whether the statement is true or false
Question 2What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?
a. The first quasars were seen to have fuzz.
b. Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths.
c. Quasars showed significant gravitational lens effects.
d. The spectra of quasars looked like that of an M dwarf.
e. The large red shifts originally indicated that they were orbiting the center of the Milky Way.
Question 3Oxygen in Earth's atmosphere is outgassed in volcanic eruptions.
Indicate whether the statement is true or false
Question 4Statistical 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.
Question 5Earth's magnetic field has reversed itself.
Indicate whether the statement is true or false
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