The Grooves and Ridges on Ganymede Are Thought to

Multiple Choice

The grooves and ridges on Ganymede are thought to

A) be due to the moon's rapid rotation.
B) be due to crustal tectonics motion (plate tectonics) .
C) have formed within the last thousand years.
D) be part of an ongoing volcanic process.
E) have grown considerably larger since the Voyager spacecraft discovered them.