Water and Life on Mars
The question of life on Mars depends heavily on the characteristics of its air and water. Mars has a relatively thin and dry atmosphere, with high percentage of carbon dioxide compared to Earth’s atmosphere. Mars tilts about25°,which leads to seasons like those on Earth. Carbon dioxide freezes into the polar caps during the winter and evaporates into the air in the summer This causes a fluctuation in the density of the atmosphere of up to 25 percent over the year With so little atmosphere, the planet experiences a wide range of temperatures, heating up in the day and rapidly cooling at night. Temperatures on Mars have been measured between-225F and95°
完整版题目和答案请付费后查阅
