page depth is inconsistent in 2012 theme

hi– i am using 2012 theme, it is clean and simple. but the depth of each page seems to be dependent on the amount of content. is this a function of that fact that it is a responsive theme, or am i doing something wrong? it is just not visually nice to see the footer jump up to the middle of the screen for one page, and then down to the very bottom of the screen when there is a lot of content on that particular page. If there is too much content on one page, is it possible to create some sort of scroll–or find a plugIn– in which you can access the content, but which does not make the window incredibly deep vertically? again, does this have something to do with the responsive design? any help or wisdom would be very much appreciated. thanks so much!