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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.
The center of Mars likely has a solid core composed of iron, nickel, and sulfur. It is estimated to be between 1,800 and 2,400 miles (3,000 and 4,000 kilometers) in diameter. The core does not move, and therefore Mars has no magnetic field.he center of Mars likely has a solid core composed of iron, nickel, and sulfur. It is estimated to be between 1,800 and 2,400 miles (3,000 and 4,000 kilometers) in diameter. The core does not move, and therefore Mars has no magnetic field.