The So-Called "Canals" That Schiaparelli and Lowell Reported Seeing on the Surface

question 133

Multiple Choice

The so-called "canals" that Schiaparelli and Lowell reported seeing on the surface of Mars were actually:

• A) the remnants of the walls of ancient craters that have been eroded by winds and dust over Mars' history.
• B) river valleys caused by massive floods early in Mars' history.
• C) lines of volcanoes along faults in the Martian surface.
• D) optical illusions.

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