You cannot have multiple accounts on google adsense. But you may have multiple sites using google adsense. It means that, when you submit your application to join for google adsense ads and they accepted, it means you can run multiple sites using that account. And make profit from a single account.

So you must be very careful in running a very poor site. Google will always take care of its brand image.

There's something else to think about too. Google is mostlikely to place HIGHER earning ads on your site because, whilst on Google's own page there can be up to 8 ads, with AdSense there can only be a maximum of 5.

When creating new sites with adsense make sure that it doesnt violate the Google adsense TOS. Or else, you will be banned by Google.

In order to expose your websites to search engines you'll need to create an .xml Sitemap file that includes a list of all pages within your website.

This website provides a simply solution for creating a sitemap www.sitemapspal.com. Create and upload this file into your websites root directory. This enables Googles webcrawler to detect and index all of your pages!

Take a look at Adsense tips and tricks at Great Adsense.