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One reason is that Mars doesn't now because the interior is too cold for the convection currents in the mantle that drive the movement of plates. It is also too cold for a molten core to generate a strong magnetic field to protect the surface form radiation and keeps the atmosphere intact. In the past, Mars might have had a warmer interio with a molten core, and so a strong magnetic field and more geological activity. A reason why Mars wouldn't have plates anyway is the theory that planets less massive than Earth are not massive enough for plates to form. Planets the Earth's size still require a large mass like the Moon for plate tectonics, while larger planets do not necessarily require a large moon.
For example, Mercury has a weak magnetic field. But, since it has a very low rotation rate we conclude that it has a large liquid core. Mars has a high rotation rate (similar to Earth's), but a magnetic field that is 1/800th the strength of the Earth's.Therefore, we conclude that Mars has a very small core.ur understanding of the origin to magnetic fields in planets is very poor. We know that the Earth's magnetic field is not due to the presence of a giant permanent magnet, such as iron, deep in the Earth's core because 1) the core temperature is above the Cure temperature and 2) the field is too variable.