Soil Mars

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exposure of silica-rich dust uncovered spirit rover


the phoenix lander returned data showing martian soil alkaline , containing elements such magnesium, sodium, potassium , chlorine. these nutrients found in soils on earth, , necessary growth of plants. experiments performed lander showed martian soil has basic ph of 7.7, , contains 0.6% of salt perchlorate.


streaks common across mars , new ones appear on steep slopes of craters, troughs, , valleys. streaks dark @ first , lighter age. streaks can start in tiny area, spread out hundreds of metres. have been seen follow edges of boulders , other obstacles in path. commonly accepted theories include dark underlying layers of soil revealed after avalanches of bright dust or dust devils. several other explanations have been put forward, including involve water or growth of organisms.








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