The atmosphere above the surface of Mars is about 100 times less dense than the atmosphere of Earth. The Martian atmosphere is dense enough to support a weather system that includes clouds and winds. According to experts, Mars' roller coaster-like weather is more chaotic and unpredictable than scientists first thought. At times, the sky can appear pink and cloudless, filled with windblown dust raised from the rusty Martian surface. Tremendous dust storms sometimes rage over the …showed first 75 words of 586 total…

…showed last 75 words of 586 total…when the crater floor rebounds upward after an impact. Much of the surface of the southern hemisphere is extremely old, and it contains many craters. Other parts of the surface, especially in the northern hemisphere, are younger and thus have fewer craters. (Mars, 2002) References The Surface of Mars. (2002). Canyons and plains. [Online]. Available: http://www.nasm.si.edu/ceps/etp/mars/surface.html Mars Atmosphere. (2002). [Online]. Available: http://chapters.marssociety.org/polska/mars_atmosphere.html