This image shows the grooved terrain of Ganymede.
Click on image for full size
Grooves of Ganymede
Instead of icy-volcanism, the surface of Ganymede reveals gradual surface deformation and stretching, a stretching similar to the crustal deformation of the Earth. In this case, the folding and stretching of the crust of Ganymede resulted in big blocks of the crust being pulled apart, as shown in this image. The pulling apart of blocks of crust is similar to the terrestrial "rifting" process.
The lack of icy-volcanism, such as that found on Europa, probably stems from a lack of the kind of heating undergone by Europa. The existence of surface deformation and stretching suggests that there has been some heating of Ganymede, nonetheless.
Shop Windows to the Universe Science Store!
Our online store
on science education, classroom activities in The Earth Scientist
specimens, and educational games
You might also be interested in:
Mountains are built through a general process called "deformation" of the crust of the Earth. Deformation is a fancy word which could also mean "folding". An example of this kind of folding comes from...more
This image shows an example of the grooved terrain of Ganymede. The image clearly shows that some things hit Ganymede and made craters after the grooves were made, because the grooves are underneath the...more
There has been no icy volcanism on Ganymede, nor continental drift, but it does seem that there have been movements of the surface. Examination of the surface of Ganymede reveals many kinds of faulting....more
Amalthea was discovered by E Barnard in 1872. Of the 17 moons it is the 3rd closest to Jupiter, with a standoff distance of 181,300 km. Amalthea is about the size of a county or small state, and is just...more
Callisto was first discovered by Galileo in 1610, making it one of the Galilean Satellites. Of the 60 moons it is the 8th closest to Jupiter, with a standoff distance of 1,070,000 km. It is the 2nd largest...more
The insides of most of the moons and planets separated while they were forming out of the primitive solar nebula. Measurements by the Galileo spacecraft have been shown that Callisto is the same inside...more
Many examples of the differing types of surface are shown in this image. In the foreground is a huge impact crater, which extends for almost an entire hemisphere on the surface. This crater may be compared...more