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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.
Top 10 facts about the world. Tectonic plates are large plates of rock that make up the foundation of the Earth's crust and the shape of the continents. The tectonic plates comprise the bottom of the crust and the top of the Earth's mantle. There are ten major plates on Earth and many more minor ones. They float on a plastic-like part of the Earth's mantle called the asthenosphere. The plates are most famously known for being the source of earthquakes.