The presence of water of Mars has been known for many years; its ice caps are largely made of frozen water. Scientists reported recently that they had spotted widespread deposits of opals on the surface of Mars. Opals are minerals that require liquid water. Opal deposits lie in areas that appear to have been formed about two billion years ago.
Which of the following can be logically concluded from the above statements?
A. The planet must have had flowing water such as a river till recently.
B.
...
Which of the following can be logically concluded from the above statements?
A. The planet must have had flowing water such as a river till recently.
B.
...
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