The Bridge V Learning Edition 1 ; our solar system | Page 8

Mars
Ma rs is half the si ze of the Ea rth . Its redd is h c ol ou r i s c aus ed by i ron ox id e
(whi ch yo u a nd I ma y c all rus t). It do es have a n a tmo sp he re bu t i t is ve ry thi n
a nd co nsi s ts of ca rb on di oxi de . (wh y d oe s i t no t ha ve a g re en hou se effe c t)
On e of i ts spe ci al fea tu re s is i ts “ca nal s ” wh ich su gg es t tha t on ce up on a time
i t ha d run nin g s u rfa ce wa te r an d e x tin c t vo lc ano es , whic h re ach he igh ts of up
to 22 ,00 0 me tre s!
Ma rs ha s two ve ry small m oon s a nd ne eds ab ou t twice as m uch time a s th e
E arth to o rbi t the Sun. L ik e Ea rth , i t a ls o ha s s ea so ns , as i ts ro ta tio n ax is i s
i ncli ne d .