What is Geology?

Over the next few days there are a lot of new students starting their journey through the science of Geology and discovering an exciting new way of looking at the world through the eyes of a Geologist.  It does beg the question "What is Geology?"

The definition of the word is a start:

but that doesn't really give the full breadth of the scope of the subject.  Reading the blog posts on here will give you an idea of what geologists do.