Question

What feature on the surface of mars caused scientist to speculate that water was once found there??

A.)snow
B.)ice covered lakes
C.)mountains
D.)channels

Answer 1

Mars has many channels that show signs of being carved by water erosion, leading scientists to believe that Mars once had water, so D

also with this theory, it is believed that Mars had an atmosphere that was blown off at some point, causing the water to evaporate into space.