The wikipedia article on Tharsis (a big volcanic bulge on the side of mars, with Olympus Mons on), implies its weight might have made the bulge on the opposite side (Arabia Terra).
Does that make any sense? If the planet was solid, you could imagine one side of the planet sinking pushing the other up, but it has magma in because it has volcanos, so it'd just makes local waves (Tharsis trench).
Does that make any sense? If the planet was solid, you could imagine one side of the planet sinking pushing the other up, but it has magma in because it has volcanos, so it'd just makes local waves (Tharsis trench).