I'm an amateur geologist. I do what they call rockhounding.
Oh I have always thought geology was interesting.
It's easy to do. All you gotta do is pick up your first rock and start a collection.
That's cool. It seems much more complex than that.
Well, it can get more complex. I have a geologist's hammer to collect various specimens. 
That's so cool! I might get me one!
It's small. It's kinda like a miniature pick-axe, with a pick on one end and a hammer on the other. 
Geology sounds interesting.