The huge impact of an object that produced the circular Caloris Basin and its ring of mountains on Mercury also produced
A) a very localized region of magnetic field, the only magnetic field possessed by Mercury.
B) melting of permafrost, causing massive floods that produced deep valleys on Mercury's surface.
C) a pattern of jumbled terrain diametrically opposite the basin, caused by the focused seismic waves from the original impact.
D) a very thick, dusty atmosphere that still obscures the planet's surface.
Correct Answer:
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