<P> Valles Marineris may be a tectonic boundary . </P> <P> Observations made of the magnetic field of Mars by the Mars Global Surveyor spacecraft in 1999 showed patterns of magnetic striping discovered on this planet . Some scientists interpreted these as requiring plate tectonic processes, such as seafloor spreading . However, their data fail a "magnetic reversal test", which is used to see if they were formed by flipping polarities of a global magnetic field . </P> <P> Some of the satellites of Jupiter have features that may be related to plate - tectonic style deformation, although the materials and specific mechanisms may be different from plate - tectonic activity on Earth . On 8 September 2014, NASA reported finding evidence of plate tectonics on Europa, a satellite of Jupiter--the first sign of subduction activity on another world other than Earth . </P> <P> Titan, the largest moon of Saturn, was reported to show tectonic activity in images taken by the Huygens probe, which landed on Titan on January 14, 2005 . </P>

What are the 2 types of earths crust