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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.
This mantle is made up of silicates. If the planetâs core is liquid then its mantle is closer to the consistency of soft rock paste that is less dense than its core. This mantle is then covered by a crust which can vary in terms of thickness from 50 km to 125 km.This is comparably thicker than the Earthâs own crust which averages 40 km.nown as the red planet, Mars is nearly half the size of the Earth. Its outer surface is composed of mostly basalt that was brought to the surface by ancient volcanoes, which were active during the planetâs early history.