Use the following questions to check your understanding of some of the many types of visual information used in astronomy. For additional practice, try the Chapter 9 Visual Quiz at Mastering Astronomy.
The image from a MESSENGER flyby shows evidence of impact catering, volcanism, and tectonic activity on Mercury. Answer the following questions based on the image. Remember that craters are bowl-shaped and rough-floored when they form, and wipe out any preexisting features in the area. Lava on Mercury appears to be fairly runny and makes flat smooth plains as it spreads out.
3. A tectonic ridge appears to connect points 3a and 3b, crossing several craters. From its appearance, we can conclude that it must have formed
a. before the area was cratered
b. after the area was cratered
c. at the same time the area was cratered
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The Cosmic Perspective (9th Edition)
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