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Planeta Marte (Mars)(2)

Analysis of the satellite data indicates that Mars appears to lack active plate tectonics(carencia de actividad tectónica de placas) at present(en la actualidad); there is no evidence of recent lateral motion of the surface(corrimiento de tierras). With no plate motion, hot spots(puntos calientes, activos) under the crust(corteza) stay in a fixed position relative to the surface; this, along with(junto con) the lower surface gravity, may be the explanation for the giant volcanoes. However, there is no evidence of current volcanic activity. There is evidence of erosion caused by floods(inundaciones) and small river systems. The possible identification of rounded pebbles(guijarro) and cobbles(adoquines)  on the ground, and sockets(cuencas)  and pebbles in some rocks, suggests conglomerates that formed in running water(agua corriente)  during a warmer past some 2-4 billion years ago, when liquid water was stable and there was water on the surface, possibly even large lakes(glagos)  or oceans. There is also evidence of flooding that occurred less that several million years ago, most likely(más que probablemente)  as the result of the release(liberación) of water from aquifers(acuíferos) deep underground(en las profundidades del subsuelo).

Seasonal Changes(cambios estacionales)
Because the axis of rotation is tilted(inclinado) about 25° to the plane of revolution, Mars experiences seasons somewhat(algo) similar to those of the earth. One of the most apparent seasonal changes is the growing or shrinking(encogimiento, reducción) of white areas near the poles known as polar caps(gorras, tapones, fundas). These polar caps may be composed of ordinary ice or of dry ice (frozen carbon dioxide) and are thought to be(se piensa que son) only a few inches thick. During the Martian summer the polar cap in that hemisphere shrinks and the dark regions grow darker; in winter the polar cap grows again and the dark regions become paler(más pálidos).

Satellites of Mars
Mars has two natural satellites, discovered by Asaph Hall in 1877. The innermost(el más interior)  of these, Phobos, is about 7 mi (11 km) in diameter and orbits the planet with a period far less than Mars's period of rotation (7 hr 39 min), causing it to rise(levantarse, surgir, aparecer) in the west and set in the east. The outer satellite, Deimos, is about 4 mi (6 km) in diameter. 
 
 
Fuente: http://www.encyclopedia.com

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