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The dark and relatively featureless lunar plains, clearly seen with the naked eye, are called maria (Latin for "seas"; singular mare), as they were once believed to be filled with water;[60] they are now known to be vast solidified pools of ancient basalticlava. Although similar to terrestrial basalts, lunar basalts have more iron and no minerals altered by water.[61] The majority of these lavas erupted or flowed into the depressions associated with impact basins. Several geologic provinces containing shield volcanoes and volcanic domes are found within the near side "maria".[62]

Terraforming of Mars is a hypothetical process of planetary engineering by which the surface and climate of Mars would be deliberately changed to make large areas of the environment hospitable to humans, thus making the colonization of Mars safer and sustainable. There are a few proposed terraforming concepts, some of which present prohibitive economic and natural resource costs. [1] As of 2018 it is not feasible, using existing technology, to carry out any activities that significantly increase the atmospheric carbon dioxide (CO 2) pressure[clarification needed] or provide any significant warming of the planet. Any climate change induced in the near term is ...