1.524AU from the Sun . The polar caps are of water ice with seasonal solid CO 2 . The Tharsis Bulge is an uplifted or volcanic plateau.
Large canyons exist and there is evidence of former water erosion .
Some basaltic meteorites are derived from Mars. It has two small satellites , Phobos and Deimos, probably captured asteroids . Antarctic meteorites A Dictionary of Earth Sciences 4. All rights reserved.