What were the canals on Mars eventually found to be? How do they differ from the outflow channels and valley networks on Mars?
a. The canals were optical illusions. The outflow channels and valley networks on Mars are not as straight and organized.
b. The canals were actually the outflow channels and valley networks.
c. The canals were ancient constructions made by aliens. The outflow channels and valley networks are geological structures.
d. The canals were cracks in the crust. They are much deeper than the outflow channels and valley networks.
Answer: a. The canals were optical illusions. The outflow channels and valley networks on Mars are not as straight and organized.
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