Why do experiments require a control? Guide scholars through designing an experiment to see what they can do to evaporate water faster with a lesson plan that stresses the importance of controlling all variables. The second activity...

This site offers a clear definition of what is expected in a definition essay. It also provides a link to a sample paper, with instructor's comments, as well as a link to the Purdue University On-Line Writing Lab.

As part of a revision and writing section of BBC Bitesize, this site goes over several tips of general advice to keep in mind when writing about observations (as part of descriptive writing).

As part of a revision and writing section of BBC Bitesize focusing on specific forms of writing, this site discusses describing people as a type of descriptive writing.