The main difference between Bright and Dark Nebulae is ________
A) their proximity to a blue star
B) the composition of their dust
C) the composition of their gases
D) their proximity to a black hole
E) none of the above
A
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What Latin American country has promoted a "myth of racial democracy"?
A) Mexico B) Brazil C) Chile D) Argentina E) Bolivia
According to the WHO, the greatest global root cause of risk of disease is
a. infectious disease. b. heart disease. c. poverty. d. cancer.
An index fossil must be:
a) limited to a particular region b) very rare c) long-lived in terms of geologic time d) easily identifiable in the field e) all of the above
The difference between fog and a cloud is:
A) they form via a different process. B) fog never forms in mountains. C) clouds can have ice crystals in them but fog can't. D) nothing. Clouds and fog are a matter of observational perspective.