Multiple Choice
In 1981, from space, an imaging radar system was used to bounce radar signals off the surfaces of the world's major deserts to study the history of the earth's aridity; the system also unexpectedly revealed
A) evidence of ancient camel caravans.
B) oil reserves.
C) ancient watercourses
D) large mounds and buildings.
Correct Answer:

Verified
Correct Answer:
Verified
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