This document discusses using blogs as an assessment tool for science classes and provides steps for an activity on tides. It begins by defining what a blog is. It then provides directions for an activity where students access tide data from a website, input it into Excel to create a tide graph, and post the graph and answers to tidal questions on a class blog. The document lists several online resources and websites that can be used for activities, including blogs, timelines, virtual labs, and NASA.