Explanation
Makes something clear
http://encyclopedia.kids.net.au/page/ex/Explanation
http://www.primaryresources.co.uk/english/englishD4.htm
http://www.pinterest.com/happymama2/writing/
http://www.pinterest.com/explore/explanation-writing/
Video
http://www.youtube.com/watch?v=E06yO0kPtis