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Geologists think that the eroded surfaces, alluvial fans, and Valles Marineris indicate that the Martian climate was once __________ and that __________ flowed across the surface.
Q6: The _ is the ultimate climate source
Q9: Surface currents are mostly _-driven.<br>A) gravity<br>B) sand<br>C)
Q17: Mineral reserves remain constant over time.
Q21: The three categories used by geologists to
Q26: A syncline:<br>A) always forms mountain peaks.<br>B) always
Q27: The Earth's surface emits _ radiation.<br>A) high-energy
Q37: The big bang theory is supported by:<br>A)
Q40: The same mineral that solidifies slowly to
Q55: The sunlight we see from Earth comes
Q58: Plutonic rocks are usually medium- or coarse-grained,