17. Give me an example of a site that is a good resource for scientific information.
] This is the URL for one of my favorite astronomy sites: "Astronomy Picture of the Day" which is part of the NASA web site. I have learned so much about astronomy, meteorology and other sciences from this web site.
1. Why is it better to use iframes than using frames?
Web pages using frames are really several different html documents that come together to create one "web page." The frame tag replaces the body tag on the html document. Because of this, each html document must be coded separately, which can take a long time and a lot of typing, making it an arduous task to maintain. In addition, because the page involves the use of several different documents, this means each one of them needs to be loaded separately which can lengthen the time needed to load the page. This extra time to load the page could be the difference between when a user chooses to wait for the page to load or decides that it is not worth waiting and navigates away from your page.
On the other hand, iframes consist of one frame that is embedded onto a single web page. This offers the advantages of frames, which include a consistent look throughout a web site without the disadvantages of frames. Instead of having to code several different html documents to make the appearance of one page, there is one iframe that interchanges with another to give the appearance of moving to another page while the background remains the same. Another advantage is that for iframes the browser only has to look for one html document and loads it much the same as if it were loading an image. This means quicker load times than frames. Also, using frames, the user can resize an individual frame thereby altering the look of the page. This is not the case with iframes, giving the web developer a little more control in the presentation of the page.