This image from NASAs Mars Odyssey shows a region of chaos terrain south of Eos Chasma.

This image from NASAs Mars Odyssey shows linear features, tectonic graben called Icaria Fossae and they are located in Terra Sirenum.

This image from NASAs Mars Odyssey shows part of the south polar cap. This image was taken at the end of southern summer.

This image from NASAs Mars Odyssey shows part of the south polar cap. This image was taken at the end of southern summer.

This image from NASAs Mars Odyssey shows a dune field in southern Cimmeria Terra, located in the very shallow remnants of an old crater.

This image from NASAs Mars Odyssey shows part of the south polar cap. This image was taken at the end of southern summer.

This image from NASAs Mars Odyssey shows a portion of Sirenum Fossae. The linear features are tectonic graben. Graben are formed by extension of th...

This image from NASAs Mars Odyssey shows part of an unnamed crater located in Noachis Terra.

This image from NASAs Mars Odyssey shows part of Gorgonum Chaos. Chaos terrain is typified by regions of blocky, often steep sided, mesas intersper...

This image from NASAs Mars Odyssey shows sand dunes within Proctor Crater.

This image from NASAs Mars Odyssey shows an area eroded by the wind. It has been suggested that the surface is comprised of volcanic ash deposits, ...

This image from NASAs Mars Odyssey shows Arsia Mons, the southernmost of the Tharsis volcanoes.

This image from NASAs Mars Odyssey shows a cross section of Coprates Chasma.

This image from NASAs Mars Odyssey shows part of the south polar cap. This image was taken near the end of southern summer.

This image from NASAs Mars Odyssey shows part of the south polar cap. This image was taken near the end of southern summer.

This image from NASAs Mars Odyssey shows part of the flank of Tyrrhenus Mons. Tyrrhenus Mons is one of the oldest martian volcanoes.

This image from NASAs Mars Odyssey shows Matara Crater, with a large sand deposit on its floor.

This image from NASAs Mars Odyssey shows a cross section of Coprates Chasma. The floor of the canyon is covered by large landslide deposits.

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows part of Ius Chasma. Ius Chasma is at the western end of Valles Marineris.

This image from NASAs Mars Odyssey shows graben, part of Memnonia Fossae.

This image from NASAs Mars Odyssey shows part of the floor of Russell Crater.

This image from NASAs Mars Odyssey shows a sand sheet located on the floor of an unnamed crater just north of the edge of the South polar ice cap.

This image from NASAs Mars Odyssey shows part of the rim of an unnamed crater in Terra Sirenum.

This image from NASAs Mars Odyssey shows a short section of Reull Vallis. Reull Vallis starts in Promethei Terra and empties into Hellas Plainitia.

This image from NASAs Mars Odyssey shows several regions of sand dunes located on the southern part of Kaiser Crater.

This image from NASAs Mars Odyssey shows Claritas Fossae, a graben filled highland located between the lava plains of Daedalia Planum and Solis Pla...

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons. Arsia Mons is the southernmost ...

This image from NASAs Mars Odyssey shows Ius and Tithonium Chasmata, located at the western end of Valles Marineris.

This image from NASAs Mars Odyssey shows a cross section of the upper elevations of Pavonis Mons, including part of the summit caldera.

This image from NASAs Mars Odyssey shows the part of the eastern end of Tithonium Chasma. Tithonium Chasma is at the western end of Valles Marineris.

This image from NASAs Mars Odyssey shows a portion of Sirenum Fossae. The linear features are tectonic graben. Graben are formed by extension of th...

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows part of Ariadnes Colles. The term colles means hills or knobs.

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows a small portion of the immense lava flows that originated from Arsia Mons.

This image from NASAs Mars Odyssey shows part of the rim of an unnamed crater in Terra Sirenum.

This image from NASAs Mars Odyssey shows a complete cross section of Ius Chasma. Ius Chasma is at the western end of Valles Marineris.

This image from NASAs Mars Odyssey shows a windstreak located on the Tharsis volcanic flows east of Arsia Mons.

This image from NASAs Mars Odyssey shows a portion of Sirenum Fossae. The linear features are tectonic graben. Graben are formed by extension of th...

This image from NASAs Mars Odyssey shows Claritas Fossae, a graben filled highland located between the lava plains of Daedalia Planum and Solis Pla...

This image from NASAs Mars Odyssey shows part of Gale Crater, including the large layered deposit on the crater floor.

This image from NASAs Mars Odyssey shows part of the south polar cap. The cap is comprised of layers of ice and dust deposited over millions of years.

This image from NASAs Mars Odyssey shows part of Gorgonum Chaos. Chaos terrain is typified by regions of blocky, often steep sided, mesas intersper...

This image from NASAs Mars Odyssey shows a portion of Sirenum Fossae. The linear features are tectonic graben. Graben are formed by extension of th...

This image from NASAs Mars Odyssey shows the complete length of two channels in northern Terra Sirenum.

This image from NASAs Mars Odyssey shows a short section of Reull Vallis. Reull Vallis starts in Promethei Terra and empties into Hellas Plainitia.

This image from NASAs Mars Odyssey shows a short section of Reull Vallis. Reull Vallis starts in Promethei Terra and empties into Hellas Plainitia.

This image from NASAs Mars Odyssey shows part of Atlantis Chaos. Chaos terrain is typified by regions of blocky, often steep sided, mesas intersper...