Name four properties of Mars that are different from those of Earth today.
a. No magnetic field; lower density; thin atmosphere of mostly ; no plate tectonics.
b. No magnetic field; lower density; no atmosphere; old cratered surface.
c. No differentiation of interior; slow rotation; thin atmosphere of mostly ; no plate tectonics.
d. No differentiation of the interior; slow rotation; no atmosphere; old cratered surface.
Answer: a. No magnetic field; lower density; thin atmosphere of mostly ; no plate tectonics.
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