Final answer:
The question refers to the erosional features of Mars, specifically outflow channels and gullies, suggesting the past or present flow of water on the planet's surface which points to geomorphologic activity potentially involving liquid water eruptions from underground sources.
Step-by-step explanation:
The characteristics mentioned in the question likely refer to the features of outflow channels which can be related to geomorphologic processes on Mars. Outflow channels, much larger than runoff channels, are evidence of massive water flow on the Martian surface, shaping the landscape. They can cause a type of mass wasting where slope material saturated with water can lead to debris or mud flows. These flows have the power to pick up and carry significant debris, including large boulders, and can lead to further flooding and changes in the terrain.
The gullies observed on Mars, especially those imaged by the Mars Global Surveyor, also suggest the action of flowing water. The gullies appear young, lack superimposed impact craters, and cut across recently deposited dunes. This fluid flow suggests that there could be liquid water underground that occasionally surfaces, creating short-lived streams before it freezes or evaporates. This hypothesis is supported by the fact that these gullies experience seasonal changes, such as elongation of dark streaks, which could imply the involvement of liquid water or sediments flowing downhill.