The valley networks on Mars are terrains eroded by flowing water billions of years ago.

In places where the bedrock is well exposed, we often see a variety of colors due to altered minerals and polygonal patterns perhaps due to wet, clay-rich deposits.

ID: ESP_045299_1545
date: 26 March 2016
altitude: 256 km

https://uahirise.org/hipod/ESP_045299_1545
NASA/JPL-Caltech/UArizona
#Mars #science #NASA