THEMIS: Softly rounded hills in Phlegra Montes

Arcadia's rounded hills (THEMIS_IOTD_20180425)THEMIS Image of the Day, April 25, 2018. The rounded hills in this VIS image are located in Arcadia Planitia. Broad linear ridges and groups of hills in this region are part of Phlegra Dorsa (ridges) and Phlegra Montes (hills). The smooth shapes suggest they are covered in an ice-rich mantle

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