Given the task definition and input, reply with output. In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

Some of these include the inner structure of the terrestrial planets , volcanism on planets , craters , fluvial and aeolian processes .

Planetary geology includes such topics as determining the internal structure of the terrestrial planets , and also looks at planetary volcanism and surface processes such as impact craters , fluvial and aeolian processes .