Based on research from data collected with the MESSENGER spacecraft, NASA believes that Mercury is tectonically active. If correct, this makes Mercury the only tectonically active planet in the solar system other than the Earth.
Towards the end of its mission, MESSENGER flew closer to the surface of Mercury and captured images of small fault scarps. The scientists determined that due to their small size and the fact that they had not yet been destroyed by frequent meteor and comet impacts, these scarps must be geologically young. This indicates that Mercury must be tectonically active for new scarps to have formed. Their theory also states that Mercury is shrinking due to contraction from its slowly cooling outer core.
Source: NASA
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