What does an unconformity in a sequence of rock layers reveal about geologic history? a. a rock layer must have turned upside down. b. a layer of rock might have eroded. c. the layers must cover hundreds of square miles. d. the layers must have been deposited very quickly.

analyze the map below and answer the question that follows.

what does the map above tell us about the endemity of typhoid fever?

a.

there is greater occurrence of the disease in the western hemisphere.

b.

there is greater occurance of the disease in the northern hemisphere.

c.

countries located in equatorial regions are more likely to have incidents of typhoid fever.

d.

typhoid fever is more rampant among caucasian populations.

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