Daily temperature changes of areas on the Earths surface
The degree of radioactivity emitted by exposed rocks on the Earths surface
Atmospheric conditions over large landmasses
20. It can be inferred from the passage that a major disadvantage of photographic imaging in geologic mapping is that such photography
cannot be used at night
cannot focus on the details of a geologic area
must be chemically processed
is always enhanced by digital reconstruction
cannot reflect changes over extended periods of time
21. It can be inferred from the passage that Landsat images differ from conventional geologic maps in that Landsat images
reveal the exact size of petroleum deposits and ore deposits
indicate the continuity of features that might not otherwise be interpreted as continuous
predict the movements of glaciers
provide highly accurate data about the occurrence of mineral deposits
reveal the integrity of the media in which petroleum deposits and ore deposits are found
22. The passage provides information about each of the following topics EXCEPT:
the principal method of geologic remote sensing prior to the mid-1960s
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