“Mars has a diameter about as wide as the continent of Africa. Its overall size, or surface area, is about eight times less than Earth’s, but it has the same amount of dry land.” jpl.nasa.gov
Having the same amount of dry land as earth does correlates exactly to the concept of super-continents except without oceanic crust on a planetary scale.
“Two hundred and fifty million years ago the landmasses of Earth were clustered into one supercontinent dubbed Pangaea.” science.nasa.gov
“Many scientists consider Mars to be volcanically active, even if we have not observed an eruption. Basalt meteorites from Mars indicate that volcanism has occurred in the last 180 million years. Very few impact craters occur on the lava flows of Olympus Mons, suggesting that this volcano has probably erupted in the last few million years.” solarsystem.nasa.gov
“Mars clearly had a watery history, with strong evidence of flowing streams and even some indications that an ocean was present in the distant past. The fate of Mars’ water isn’t understood, but there’s evidence that some of it may have gone underground and is currently circulating in the bedrock of the red planet.
A study being released by Science finds further evidence that some of Mars’ underground waters have burst to the surface violently. Using radar imaging, a team of scientists has tracked a series of channels buried under more recent features and has followed them back toward the source. The imaging showed that the main channel was about 40 kilometers wide and at least 70 meters deep. That’s roughly the same size as the features carved by the largest well-characterized floods on Earth.
The work involved a radar instrument called SHARAD on the Mars Reconnaissance Orbiter. The radar can penetrate some surface features, revealing several layers beneath—depending on how they reflect the incoming radiation. This turned out to be extremely useful at the feature in question, Marte Vallis. It’s one of a number of features on the Martian surface that suggests catastrophic flooding, but it’s quite young at 500 million years old, long after water was thought to be common on the Martian surface. Unfortunately, studying it is complicated by the fact that it has been buried by an even younger feature: volcanic eruptions that make it difficult to even identify the source of the flood waters.”
“The authors note that the only confirmed flood feature of similar magnitude on Earth is also the largest we know of: the draining of Lake Missoula, which broke through a glacial dam and wiped out a lot of the soil of the eastern side of Washington during the last glacial period.”
“The similarities are striking. Each planet has roughly the same amount of land surface area. Atmospheric chemistry is relatively similar, at least as Earth is compared to the other planets in the solar system. Both planets have large, sustained polar caps and the current thinking is that they’re both largely made of water ice. The sibling planets also show a similar tilt in their rotational axises, affording each of them strong seasonal variability. The neighbors also present strong historic evidence of changes in climate.
Mars does not have the same kind of magnetic field as Earth. But evidence collected by the Mars Global Surveyor (MGS) indicates that the planet may have once had a global magnetic field, generated by an internal dynamo. Evidence suggests that the planet’s magnetic field reversed direction, or flipped, several times in its early days as conditions in the mantle and core of the planet changed. But that dynamo faded, leaving only faint traces of its magnetic past locked in the Martian crust.”