Which of the following features attracted geologists' attention on Mars?
A. a meteorite resting on the Martian surface
B. layered rocks in the walls of several craters
C. small spherical objects, nicknamed blueberries, that contain the mineral hematite
D. a large area with abundant hematite discovered before the rovers landed
E. All of these choices are correct.
Answer: E
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Answer the following statement true (T) or false (F)