Why are the photos on my Nikon D70 so noisy?

As I've become a little better photographer and I've gotten to know some of the photographic terms, I've noticed that the pictures I take on my Nikon D70 are very unsharp and extremely noisy. From first glance, they look fine and very sharp, but upon zooming in, you can tell there's a lot of... show more As I've become a little better photographer and I've gotten to know some of the photographic terms, I've noticed that the pictures I take on my Nikon D70 are very unsharp and extremely noisy. From first glance, they look fine and very sharp, but upon zooming in, you can tell there's a lot of unwanted noise. (Examples on my Flickr @ flickr.com/carrickwebb.) Is there any way I can improve upon this and take better photos with this camera, or is this the quality I'm going to be getting with it no matter what?
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