17. By using the word interpretative in line 40, the author is indicating which of the following?
Some maps are based more on data from aerial photography than on data from field operations.
Some maps are based almost exclusively on laboratory measurements.
Some maps are based on incomplete data from field observations.
Some maps show only large geologic features.
Some maps can be three-dimensional.
18. With which of the following statements about geologic mapping would the author be most likely to agree?
Geologic mapping is basically an art and not a science.
Geologic mapping has not changed significantly since the early 1960s.
Geologic mapping will have limited practical applications until remote-sensing systems are perfected.
A developmental milestone in geologic mapping was reached in 1972.
Without the present variety of remote-sensing techniques, geologic mapping could not be done.
19. According to the passage, measurements of which of the following can be provided by the optomechanical scanner but not by visible-light photography?
The amount of visible light reflected from oceans
The density of foliage in remote areas on the Earths surface
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