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Why isn't the crust of Mars broken into mobile plates as Earth's crust is?a. Mars has a nondifferentiated interior; therefore, it has no tectonic activity.b. The crust of Mars is composed of very solid and heavy metals and is not easy to break.c. The crust of Mars is very thick (since it can sustain large shield volcanoes), too thick to have broken into moving plates.d. Mars has no overall magnetic field, which could break its crust into mobile plates.
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