“The mounds in Chryse Planitia are rich in clay minerals ... “Some models have suggested that Mars’ north was struck by one or more giant impacts early in its history, effectively creating the ...

The mounds are near the future landing site of ... suggested that Mars’ north was struck by one or more giant impacts early in its history, effectively creating the northern lowlands as a ...

These mounds are all that is left of a landscape ... "Mars is a model for what the early Earth might have looked like, as its lack of plate tectonics means that much of its ancient geology ...